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801521240 = 2351313711251
BaseRepresentation
bin101111110001100…
…011111001011000
32001212012111102212
4233301203321120
53120142134430
6211311214252
725601550422
oct5761437130
92055174385
10801521240
1138148a853
121a4517388
13ca096430
1478643812
154a577b95
hex2fc63e58

801521240 has 64 divisors (see below), whose sum is σ = 1956497760. Its totient is φ = 293760000.

The previous prime is 801521233. The next prime is 801521249. The reversal of 801521240 is 42125108.

It is a super-2 number, since 2×8015212402 = 1284872596342275200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801521249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65615 + ... + 76865.

Almost surely, 2801521240 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 801521240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978248880).

801521240 is an abundant number, since it is smaller than the sum of its proper divisors (1154976520).

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

801521240 is a wasteful number, since it uses less digits than its factorization.

801521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11412 (or 11408 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 801521240 is about 28311.1504534874. The cubic root of 801521240 is about 928.9058083662.

Adding to 801521240 its reverse (42125108), we get a palindrome (843646348).

The spelling of 801521240 in words is "eight hundred one million, five hundred twenty-one thousand, two hundred forty".

Divisors: 1 2 4 5 8 10 13 20 26 40 52 65 104 130 137 260 274 520 548 685 1096 1370 1781 2740 3562 5480 7124 8905 11251 14248 17810 22502 35620 45004 56255 71240 90008 112510 146263 225020 292526 450040 585052 731315 1170104 1462630 1541387 2925260 3082774 5850520 6165548 7706935 12331096 15413870 20038031 30827740 40076062 61655480 80152124 100190155 160304248 200380310 400760620 801521240