68392720 has 40 divisors (see below), whose sum is σ = 173471040. Its totient is φ = 24869760.

The previous prime is 68392711. The next prime is 68392733. The reversal of 68392720 is 2729386.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 68392720.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37980 + ... + 39739.

It is an arithmetic number, because the mean of its divisors is an integer number (4336776).

Almost surely, 2^68392720 is an apocalyptic number.

It is an amenable number.

68392720 is an abundant number, since it is smaller than the sum of its proper divisors (105078320).

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

68392720 is a wasteful number, since it uses less digits than its factorization.

68392720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77743 (or 77737 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 68392720 is about 8269.9891172843. The cubic root of 68392720 is about 408.9497609875.

It can be divided in two parts, 6839 and 2720, that added together give a palindrome (9559).

The spelling of 68392720 in words is "sixty-eight million, three hundred ninety-two thousand, seven hundred twenty".