687804957 has 12 divisors (see below), whose sum is σ = 1135424160. Its totient is φ = 393031368.

The previous prime is 687804947. The next prime is 687804973. The reversal of 687804957 is 759408786.

It is not a de Polignac number, because 687804957 - 2⁴ = 687804941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687804907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5458707 + ... + 5458832.

It is an arithmetic number, because the mean of its divisors is an integer number (94618680).

Almost surely, 2^687804957 is an apocalyptic number.

It is an amenable number.

687804957 is a deficient number, since it is larger than the sum of its proper divisors (447619203).

687804957 is a wasteful number, since it uses less digits than its factorization.

687804957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10917552 (or 10917549 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The square root of 687804957 is about 26226.0358613344. The cubic root of 687804957 is about 882.7175620487.

It can be divided in two parts, 68780 and 4957, that added together give a palindrome (73737).

The spelling of 687804957 in words is "six hundred eighty-seven million, eight hundred four thousand, nine hundred fifty-seven".