68684864 has 14 divisors (see below), whose sum is σ = 136296654. Its totient is φ = 34342400.

The previous prime is 68684857. The next prime is 68684939. The reversal of 68684864 is 46848686.

It can be written as a sum of positive squares in only one way, i.e., 39438400 + 29246464 = 6280^2 + 5408^2 .

It is a super-2 number, since 2×68684864² = 9435221085396992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536537 + ... + 536664.

Almost surely, 2^68684864 is an apocalyptic number.

68684864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

68684864 is a deficient number, since it is larger than the sum of its proper divisors (67611790).

68684864 is a wasteful number, since it uses less digits than its factorization.

68684864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073213 (or 1073203 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 50.

The square root of 68684864 is about 8287.6331965164. The cubic root of 68684864 is about 409.5312191230.

The spelling of 68684864 in words is "sixty-eight million, six hundred eighty-four thousand, eight hundred sixty-four".