686064291 has 16 divisors (see below), whose sum is σ = 1056613248. Its totient is φ = 391337600.

The previous prime is 686064289. The next prime is 686064307. The reversal of 686064291 is 192460686.

It is a cyclic number.

It is not a de Polignac number, because 686064291 - 2¹ = 686064289 is a prime.

It is a super-2 number, since 2×686064291² = 941368422770665362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686064221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610905 + ... + 612026.

It is an arithmetic number, because the mean of its divisors is an integer number (66038328).

Almost surely, 2^686064291 is an apocalyptic number.

686064291 is a deficient number, since it is larger than the sum of its proper divisors (370548957).

686064291 is a wasteful number, since it uses less digits than its factorization.

686064291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222962.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 686064291 is about 26192.8289995563. The cubic root of 686064291 is about 881.9722856250.

The spelling of 686064291 in words is "six hundred eighty-six million, sixty-four thousand, two hundred ninety-one".