687913025 has 6 divisors (see below), whose sum is σ = 853012182. Its totient is φ = 550330400.

The previous prime is 687913019. The next prime is 687913063. The reversal of 687913025 is 520319786.

It can be written as a sum of positive squares in 3 ways, for example, as 5041 + 687907984 = 71^2 + 26228^2 .

It is not a de Polignac number, because 687913025 - 2¹² = 687908929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13758236 + ... + 13758285.

It is an arithmetic number, because the mean of its divisors is an integer number (142168697).

Almost surely, 2^687913025 is an apocalyptic number.

It is an amenable number.

687913025 is a deficient number, since it is larger than the sum of its proper divisors (165099157).

687913025 is a wasteful number, since it uses less digits than its factorization.

687913025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27516531 (or 27516526 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 687913025 is about 26228.0960994122. The cubic root of 687913025 is about 882.7637905252.

The spelling of 687913025 in words is "six hundred eighty-seven million, nine hundred thirteen thousand, twenty-five".