686140528896 has 81 divisors (see below), whose sum is σ = 1978426942401. Its totient is φ = 228700256256.

The previous prime is 686140528889. The next prime is 686140528943. The reversal of 686140528896 is 698825041686.

The square root of 686140528896 is 828336.

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

686140528896 is a `hidden beast` number, since 6 + 8 + 6 + 14 + 0 + 528 + 8 + 96 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22788921600 + 663351607296 = 150960^2 + 814464^2 .

It is a super-2 number, since 2×686140528896² (a number of 24 digits) contains 22 as substring.

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, 39751500 + ... + 39768756.

Almost surely, 2^686140528896 is an apocalyptic number.

686140528896 is the 828336-th square number.

It is an amenable number.

686140528896 is an abundant number, since it is smaller than the sum of its proper divisors (1292286413505).

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

686140528896 is an frugal number, since it uses more digits than its factorization.

686140528896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34536 (or 17262 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 63.

The spelling of 686140528896 in words is "six hundred eighty-six billion, one hundred forty million, five hundred twenty-eight thousand, eight hundred ninety-six".