686907538 has 8 divisors (see below), whose sum is σ = 1052284032. Its totient is φ = 336146196.

The previous prime is 686907521. The next prime is 686907547. The reversal of 686907538 is 835709686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×686907538² = 943683931522442888, which contains 22 as substring.

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, 3653670 + ... + 3653857.

It is an arithmetic number, because the mean of its divisors is an integer number (131535504).

Almost surely, 2^686907538 is an apocalyptic number.

686907538 is a deficient number, since it is larger than the sum of its proper divisors (365376494).

686907538 is a wasteful number, since it uses less digits than its factorization.

686907538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7307576.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 686907538 is about 26208.9209621457. The cubic root of 686907538 is about 882.3334840323. Note that the first 3 decimals are identical.

The spelling of 686907538 in words is "six hundred eighty-six million, nine hundred seven thousand, five hundred thirty-eight".