686028864 has 56 divisors (see below), whose sum is σ = 1837029600. Its totient is φ = 225915904.

The previous prime is 686028841. The next prime is 686028881. The reversal of 686028864 is 468820686.

It is a happy number.

It is a super-2 number, since 2×686028864² = 941271204482260992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5589 + ... + 37460.

It is an arithmetic number, because the mean of its divisors is an integer number (32804100).

Almost surely, 2^686028864 is an apocalyptic number.

686028864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

686028864 is an abundant number, since it is smaller than the sum of its proper divisors (1151000736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686028864 is a wasteful number, since it uses less digits than its factorization.

686028864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43147 (or 43137 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 48.

The square root of 686028864 is about 26192.1527179421. The cubic root of 686028864 is about 881.9571042635.

The spelling of 686028864 in words is "six hundred eighty-six million, twenty-eight thousand, eight hundred sixty-four".