72115570 has 16 divisors (see below), whose sum is σ = 129967488. Its totient is φ = 28810800.

The previous prime is 72115529. The next prime is 72115591. The reversal of 72115570 is 7551127.

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, 5095 + ... + 13045.

It is an arithmetic number, because the mean of its divisors is an integer number (8122968).

Almost surely, 2^72115570 is an apocalyptic number.

72115570 is a deficient number, since it is larger than the sum of its proper divisors (57851918).

72115570 is a wasteful number, since it uses less digits than its factorization.

72115570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8865.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 72115570 is about 8492.0886712281. The cubic root of 72115570 is about 416.2392338506.

Adding to 72115570 its reverse (7551127), we get a palindrome (79666697).

The spelling of 72115570 in words is "seventy-two million, one hundred fifteen thousand, five hundred seventy".