72157044 has 24 divisors (see below), whose sum is σ = 178270848. Its totient is φ = 22637440.

The previous prime is 72157037. The next prime is 72157073. The reversal of 72157044 is 44075127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176652 + ... + 177059.

It is an arithmetic number, because the mean of its divisors is an integer number (7427952).

Almost surely, 2^72157044 is an apocalyptic number.

It is an amenable number.

72157044 is an abundant number, since it is smaller than the sum of its proper divisors (106113804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72157044 is a wasteful number, since it uses less digits than its factorization.

72157044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353735 (or 353733 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 72157044 is about 8494.5302401016. The cubic root of 72157044 is about 416.3190122659.

The spelling of 72157044 in words is "seventy-two million, one hundred fifty-seven thousand, forty-four".