686910636 has 72 divisors (see below), whose sum is σ = 1842501024. Its totient is φ = 215032320.

The previous prime is 686910613. The next prime is 686910643. The reversal of 686910636 is 636019686.

686910636 is a `hidden beast` number, since 6 + 8 + 6 + 9 + 1 + 0 + 636 = 666.

686910636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 686910591 and 686910600.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 374241 + ... + 376071.

It is an arithmetic number, because the mean of its divisors is an integer number (25590292).

Almost surely, 2^686910636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686910636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (921250512).

686910636 is an abundant number, since it is smaller than the sum of its proper divisors (1155590388).

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

686910636 is a wasteful number, since it uses less digits than its factorization.

686910636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471 (or 2466 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 686910636 is about 26208.9800640925. The cubic root of 686910636 is about 882.3348104918.

The spelling of 686910636 in words is "six hundred eighty-six million, nine hundred ten thousand, six hundred thirty-six".