72725668 has 6 divisors (see below), whose sum is σ = 127269926. Its totient is φ = 36362832.

The previous prime is 72725651. The next prime is 72725687. The reversal of 72725668 is 86652727.

It can be written as a sum of positive squares in only one way, i.e., 60559524 + 12166144 = 7782^2 + 3488^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9090705 + ... + 9090712.

Almost surely, 2^72725668 is an apocalyptic number.

It is an amenable number.

72725668 is a deficient number, since it is larger than the sum of its proper divisors (54544258).

72725668 is a wasteful number, since it uses less digits than its factorization.

72725668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18181421 (or 18181419 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The square root of 72725668 is about 8527.9345682293. The cubic root of 72725668 is about 417.4097343909.

The spelling of 72725668 in words is "seventy-two million, seven hundred twenty-five thousand, six hundred sixty-eight".