72912068 has 6 divisors (see below), whose sum is σ = 127596126. Its totient is φ = 36456032.

The previous prime is 72912053. The next prime is 72912079. The reversal of 72912068 is 86021927.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 48330304 + 24581764 = 6952^2 + 4958^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114005 + ... + 9114012.

It is an arithmetic number, because the mean of its divisors is an integer number (21266021).

Almost surely, 2^72912068 is an apocalyptic number.

It is an amenable number.

72912068 is a deficient number, since it is larger than the sum of its proper divisors (54684058).

72912068 is a wasteful number, since it uses less digits than its factorization.

72912068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18228021 (or 18228019 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 72912068 is about 8538.8563637059. The cubic root of 72912068 is about 417.7660450677.

The spelling of 72912068 in words is "seventy-two million, nine hundred twelve thousand, sixty-eight".