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11999880 = 2333541271
BaseRepresentation
bin101101110001…
…101010001000
3211120122202000
4231301222020
511032444010
61105111000
7203666034
oct55615210
924518660
1011999880
116856762
124028460
132641c29
1418451c4
1510c07c0
hexb71a88

11999880 has 128 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 3110400.

The previous prime is 11999879. The next prime is 11999903. The reversal of 11999880 is 8899911.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44145 + ... + 44415.

It is an arithmetic number, because the mean of its divisors is an integer number (321300).

Almost surely, 211999880 is an apocalyptic number.

11999880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11999880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20563200).

11999880 is an abundant number, since it is smaller than the sum of its proper divisors (29126520).

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

11999880 is a wasteful number, since it uses less digits than its factorization.

11999880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 11999880 is about 3464.0842945864. The cubic root of 11999880 is about 228.9420853653.

It can be divided in two parts, 119 and 99880, that added together give a palindrome (99999).

The spelling of 11999880 in words is "eleven million, nine hundred ninety-nine thousand, eight hundred eighty".

Divisors: 1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 36 40 41 45 54 60 72 82 90 108 120 123 135 164 180 205 216 246 270 271 328 360 369 410 492 540 542 615 738 813 820 984 1080 1084 1107 1230 1355 1476 1626 1640 1845 2168 2214 2439 2460 2710 2952 3252 3690 4065 4428 4878 4920 5420 5535 6504 7317 7380 8130 8856 9756 10840 11070 11111 12195 14634 14760 16260 19512 22140 22222 24390 29268 32520 33333 36585 44280 44444 48780 55555 58536 66666 73170 88888 97560 99999 111110 133332 146340 166665 199998 222220 266664 292680 299997 333330 399996 444440 499995 599994 666660 799992 999990 1199988 1333320 1499985 1999980 2399976 2999970 3999960 5999940 11999880