68423728 has 20 divisors (see below), whose sum is σ = 135393120. Its totient is φ = 33483584.

The previous prime is 68423701. The next prime is 68423753. The reversal of 68423728 is 82732486.

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, 44743 + ... + 46246.

It is an arithmetic number, because the mean of its divisors is an integer number (6769656).

Almost surely, 2^68423728 is an apocalyptic number.

It is an amenable number.

68423728 is a deficient number, since it is larger than the sum of its proper divisors (66969392).

68423728 is a wasteful number, since it uses less digits than its factorization.

68423728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91044 (or 91038 counting only the distinct ones).

The product of its digits is 129024, while the sum is 40.

The square root of 68423728 is about 8271.8636352396. The cubic root of 68423728 is about 409.0115550803.

The spelling of 68423728 in words is "sixty-eight million, four hundred twenty-three thousand, seven hundred twenty-eight".