521703996 has 72 divisors (see below), whose sum is σ = 1365307776. Its totient is φ = 153766080.

The previous prime is 521703977. The next prime is 521704021. The reversal of 521703996 is 699307125.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179265 + ... + 182151.

It is an arithmetic number, because the mean of its divisors is an integer number (18962608).

Almost surely, 2^521703996 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 521703996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682653888).

521703996 is an abundant number, since it is smaller than the sum of its proper divisors (843603780).

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

521703996 is a wasteful number, since it uses less digits than its factorization.

521703996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979 (or 2940 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 521703996 is about 22840.8405274412. The cubic root of 521703996 is about 805.0225658836.

The spelling of 521703996 in words is "five hundred twenty-one million, seven hundred three thousand, nine hundred ninety-six".