521695944 has 192 divisors, whose sum is σ = 1839412800. Its totient is φ = 135475200.

The previous prime is 521695921. The next prime is 521695957. The reversal of 521695944 is 449596125.

521695944 is a `hidden beast` number, since 52 + 1 + 6 + 9 + 594 + 4 = 666.

It is a super-2 number, since 2×521695944² = 544333315972102272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521695944.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 114184 + ... + 118664.

It is an arithmetic number, because the mean of its divisors is an integer number (9580275).

Almost surely, 2^521695944 is an apocalyptic number.

521695944 is a gapful number since it is divisible by the number (54) 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 521695944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919706400).

521695944 is an abundant number, since it is smaller than the sum of its proper divisors (1317716856).

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

521695944 is a wasteful number, since it uses less digits than its factorization.

521695944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521 (or 4504 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 521695944 is about 22840.6642635454. The cubic root of 521695944 is about 805.0184242790.

The spelling of 521695944 in words is "five hundred twenty-one million, six hundred ninety-five thousand, nine hundred forty-four".