686897836 has 6 divisors (see below), whose sum is σ = 1202071220. Its totient is φ = 343448916.

The previous prime is 686897831. The next prime is 686897839. The reversal of 686897836 is 638798686.

686897836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (686897831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85862226 + ... + 85862233.

Almost surely, 2^686897836 is an apocalyptic number.

It is an amenable number.

686897836 is a deficient number, since it is larger than the sum of its proper divisors (515173384).

686897836 is a wasteful number, since it uses less digits than its factorization.

686897836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171724463 (or 171724461 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 61.

The square root of 686897836 is about 26208.7358718424. The cubic root of 686897836 is about 882.3293299362.

The spelling of 686897836 in words is "six hundred eighty-six million, eight hundred ninety-seven thousand, eight hundred thirty-six".