686622764 has 12 divisors (see below), whose sum is σ = 1234065504. Its totient is φ = 334032624.

The previous prime is 686622731. The next prime is 686622787. The reversal of 686622764 is 467226686.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2319524 + ... + 2319819.

It is an arithmetic number, because the mean of its divisors is an integer number (102838792).

Almost surely, 2^686622764 is an apocalyptic number.

It is an amenable number.

686622764 is a deficient number, since it is larger than the sum of its proper divisors (547442740).

686622764 is a wasteful number, since it uses less digits than its factorization.

686622764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639384 (or 4639382 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 47.

The square root of 686622764 is about 26203.4876304663. The cubic root of 686622764 is about 882.2115363404.

The spelling of 686622764 in words is "six hundred eighty-six million, six hundred twenty-two thousand, seven hundred sixty-four".