686368136 has 16 divisors (see below), whose sum is σ = 1287219600. Its totient is φ = 343109584.

The previous prime is 686368129. The next prime is 686368169. The reversal of 686368136 is 631863686.

It is a happy number.

It is a super-2 number, since 2×686368136² = 942202436232228992, 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, 61775 + ... + 72033.

It is an arithmetic number, because the mean of its divisors is an integer number (80451225).

Almost surely, 2^686368136 is an apocalyptic number.

It is an amenable number.

686368136 is a deficient number, since it is larger than the sum of its proper divisors (600851464).

686368136 is a wasteful number, since it uses less digits than its factorization.

686368136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18628 (or 18624 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 686368136 is about 26198.6285137219. The cubic root of 686368136 is about 882.1024693997.

The spelling of 686368136 in words is "six hundred eighty-six million, three hundred sixty-eight thousand, one hundred thirty-six".