687185604 has 54 divisors (see below), whose sum is σ = 2020658094. Its totient is φ = 196338240.

The previous prime is 687185593. The next prime is 687185617. The reversal of 687185604 is 406581786.

It is a happy number.

687185604 is a `hidden beast` number, since 6 + 87 + 1 + 8 + 560 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 675896004 + 11289600 = 25998^2 + 3360^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 687185604.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 193017 + ... + 196544.

Almost surely, 2^687185604 is an apocalyptic number.

It is an amenable number.

687185604 is an abundant number, since it is smaller than the sum of its proper divisors (1333472490).

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

687185604 is a wasteful number, since it uses less digits than its factorization.

687185604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389585 (or 389573 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 687185604 is about 26214.2252221957. The cubic root of 687185604 is about 882.4525266643.

The spelling of 687185604 in words is "six hundred eighty-seven million, one hundred eighty-five thousand, six hundred four".