686104690 has 16 divisors (see below), whose sum is σ = 1268367192. Its totient is φ = 267024384.

The previous prime is 686104633. The next prime is 686104721. The reversal of 686104690 is 96401686.

It can be written as a sum of positive squares in 4 ways, for example, as 556440921 + 129663769 = 23589^2 + 11387^2 .

It is a super-2 number, since 2×686104690² = 941479291279992200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926799 + ... + 927538.

Almost surely, 2^686104690 is an apocalyptic number.

686104690 is a deficient number, since it is larger than the sum of its proper divisors (582262502).

686104690 is a wasteful number, since it uses less digits than its factorization.

686104690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854381.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 686104690 is about 26193.6001725612. The cubic root of 686104690 is about 881.9895969759.

The spelling of 686104690 in words is "six hundred eighty-six million, one hundred four thousand, six hundred ninety".