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80915940 = 223257149431
BaseRepresentation
bin1001101001010…
…10110111100100
312122020221210200
410310222313210
5131203302230
612010150500
72001526350
oct464526744
9178227720
1080915940
1141747386
1223122430
13139c1271
14aa64460
157185160
hex4d2ade4

80915940 has 144 divisors (see below), whose sum is σ = 283046400. Its totient is φ = 18328320.

The previous prime is 80915911. The next prime is 80915941. The reversal of 80915940 is 4951908.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 80915895 and 80915904.

It is not an unprimeable number, because it can be changed into a prime (80915941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 187525 + ... + 187955.

It is an arithmetic number, because the mean of its divisors is an integer number (1965600).

It is a vampire number, since it can be written as 89409051 (with its own digits).

Almost surely, 280915940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80915940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141523200).

80915940 is an abundant number, since it is smaller than the sum of its proper divisors (202130460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80915940 is a wasteful number, since it uses less digits than its factorization.

80915940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602 (or 597 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 80915940 is about 8995.3287877653. The cubic root of 80915940 is about 432.5251458310.

The spelling of 80915940 in words is "eighty million, nine hundred fifteen thousand, nine hundred forty".

Divisors: 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 28 30 35 36 42 45 60 63 70 84 90 105 126 140 149 180 210 252 298 315 420 431 447 596 630 745 862 894 1043 1260 1293 1341 1490 1724 1788 2086 2155 2235 2586 2682 2980 3017 3129 3879 4172 4310 4470 5172 5215 5364 6034 6258 6465 6705 7758 8620 8940 9051 9387 10430 12068 12516 12930 13410 15085 15516 15645 18102 18774 19395 20860 25860 26820 27153 30170 31290 36204 37548 38790 45255 46935 54306 60340 62580 64219 77580 90510 93870 108612 128438 135765 181020 187740 192657 256876 271530 321095 385314 449533 543060 577971 642190 770628 899066 963285 1155942 1284380 1348599 1798132 1926570 2247665 2311884 2697198 2889855 3853140 4045797 4495330 5394396 5779710 6742995 8091594 8990660 11559420 13485990 16183188 20228985 26971980 40457970 80915940