68931864 has 32 divisors (see below), whose sum is σ = 191478000. Its totient is φ = 22977216.

The previous prime is 68931839. The next prime is 68931893. The reversal of 68931864 is 46813986.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159349 + ... + 159780.

Almost surely, 2^68931864 is an apocalyptic number.

It is an amenable number.

68931864 is an abundant number, since it is smaller than the sum of its proper divisors (122546136).

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

68931864 is a wasteful number, since it uses less digits than its factorization.

68931864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319144 (or 319134 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 68931864 is about 8302.5215446875. The cubic root of 68931864 is about 410.0215416007.

The spelling of 68931864 in words is "sixty-eight million, nine hundred thirty-one thousand, eight hundred sixty-four".