687396860836 has 27 divisors (see below), whose sum is σ = 1399367239137. Its totient is φ = 294593680080.

The previous prime is 687396860797. The next prime is 687396860863. The reversal of 687396860836 is 638068693786.

The square root of 687396860836 is 829094.

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., 216416622436 + 470980238400 = 465206^2 + 686280^2 .

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, 11577706 + ... + 11636926.

Almost surely, 2^687396860836 is an apocalyptic number.

687396860836 is the 829094-th square number.

It is an amenable number.

687396860836 is an abundant number, since it is smaller than the sum of its proper divisors (711970378301).

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

687396860836 is an frugal number, since it uses more digits than its factorization.

687396860836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118460 (or 59230 counting only the distinct ones).

The product of its (nonzero) digits is 376233984, while the sum is 70.

The spelling of 687396860836 in words is "six hundred eighty-seven billion, three hundred ninety-six million, eight hundred sixty thousand, eight hundred thirty-six".