687569323204 has 27 divisors (see below), whose sum is σ = 1269966360621. Its totient is φ = 325675806480.

The previous prime is 687569323193. The next prime is 687569323267. The reversal of 687569323204 is 402323965786.

The square root of 687569323204 is 829198.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 408574083204 + 278995240000 = 639198^2 + 528200^2 .

It is a super-2 number, since 2×687569323204² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31498614 + ... + 31520434.

Almost surely, 2^687569323204 is an apocalyptic number.

687569323204 is the 829198-th square number.

It is an amenable number.

687569323204 is a deficient number, since it is larger than the sum of its proper divisors (582397037417).

687569323204 is an frugal number, since it uses more digits than its factorization.

687569323204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43684 (or 21842 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 687569323204 in words is "six hundred eighty-seven billion, five hundred sixty-nine million, three hundred twenty-three thousand, two hundred four".