72717544 has 8 divisors (see below), whose sum is σ = 136345410. Its totient is φ = 36358768.

The previous prime is 72717511. The next prime is 72717553. The reversal of 72717544 is 44571727.

It can be written as a sum of positive squares in only one way, i.e., 52736644 + 19980900 = 7262^2 + 4470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4544839 + ... + 4544854.

Almost surely, 2^72717544 is an apocalyptic number.

It is an amenable number.

72717544 is a deficient number, since it is larger than the sum of its proper divisors (63627866).

72717544 is a wasteful number, since it uses less digits than its factorization.

72717544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9089699 (or 9089695 counting only the distinct ones).

The product of its digits is 54880, while the sum is 37.

The square root of 72717544 is about 8527.4582379511. The cubic root of 72717544 is about 417.3941912177.

The spelling of 72717544 in words is "seventy-two million, seven hundred seventeen thousand, five hundred forty-four".