521687040 has 208 divisors, whose sum is σ = 1909223808. Its totient is φ = 119144448.

The previous prime is 521687039. The next prime is 521687053. The reversal of 521687040 is 40786125.

It is a junction number, because it is equal to n+sod(n) for n = 521686992 and 521687010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429474 + ... + 430686.

Almost surely, 2^521687040 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 521687040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (954611904).

521687040 is an abundant number, since it is smaller than the sum of its proper divisors (1387536768).

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

521687040 is a wasteful number, since it uses less digits than its factorization.

521687040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252 (or 1230 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 521687040 is about 22840.4693471916. The cubic root of 521687040 is about 805.0138443924.

The spelling of 521687040 in words is "five hundred twenty-one million, six hundred eighty-seven thousand, forty".