72971788 has 12 divisors (see below), whose sum is σ = 127762992. Its totient is φ = 36468080.

The previous prime is 72971771. The next prime is 72971791. The reversal of 72971788 is 88717927.

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, 9906 + ... + 15622.

It is an arithmetic number, because the mean of its divisors is an integer number (10646916).

Almost surely, 2^72971788 is an apocalyptic number.

It is an amenable number.

72971788 is a deficient number, since it is larger than the sum of its proper divisors (54791204).

72971788 is a wasteful number, since it uses less digits than its factorization.

72971788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8912 (or 8910 counting only the distinct ones).

The product of its digits is 395136, while the sum is 49.

The square root of 72971788 is about 8542.3526033523. The cubic root of 72971788 is about 417.8800736519.

The spelling of 72971788 in words is "seventy-two million, nine hundred seventy-one thousand, seven hundred eighty-eight".