68278864 has 20 divisors (see below), whose sum is σ = 136558720. Its totient is φ = 33037920.

The previous prime is 68278849. The next prime is 68278877. The reversal of 68278864 is 46887286.

68278864 is an admirable number.

It is a congruent number.

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, 68334 + ... + 69325.

It is an arithmetic number, because the mean of its divisors is an integer number (6827936).

Almost surely, 2^68278864 is an apocalyptic number.

It is an amenable number.

68278864 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

68278864 is a wasteful number, since it uses less digits than its factorization.

68278864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137698 (or 137692 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 49.

The square root of 68278864 is about 8263.1025650176. The cubic root of 68278864 is about 408.7227034614.

The spelling of 68278864 in words is "sixty-eight million, two hundred seventy-eight thousand, eight hundred sixty-four".