686682256 has 20 divisors (see below), whose sum is σ = 1432789372. Its totient is φ = 316930176.

The previous prime is 686682253. The next prime is 686682277. The reversal of 686682256 is 652286686.

It can be written as a sum of positive squares in 2 ways, for example, as 39488656 + 647193600 = 6284^2 + 25440^2 .

It is not an unprimeable number, because it can be changed into a prime (686682253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650471 + ... + 1650886.

Almost surely, 2^686682256 is an apocalyptic number.

It is an amenable number.

686682256 is an abundant number, since it is smaller than the sum of its proper divisors (746107116).

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

686682256 is a wasteful number, since it uses less digits than its factorization.

686682256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301378 (or 3301372 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The square root of 686682256 is about 26204.6227982774. The cubic root of 686682256 is about 882.2370151602.

The spelling of 686682256 in words is "six hundred eighty-six million, six hundred eighty-two thousand, two hundred fifty-six".