72120172 has 12 divisors (see below), whose sum is σ = 127058400. Its totient is φ = 35817776.

The previous prime is 72120163. The next prime is 72120241. The reversal of 72120172 is 27102127.

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, 59908 + ... + 61099.

It is an arithmetic number, because the mean of its divisors is an integer number (10588200).

Almost surely, 2^72120172 is an apocalyptic number.

It is an amenable number.

72120172 is a deficient number, since it is larger than the sum of its proper divisors (54938228).

72120172 is a wasteful number, since it uses less digits than its factorization.

72120172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121160 (or 121158 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 72120172 is about 8492.3596249806. The cubic root of 72120172 is about 416.2480876585.

Adding to 72120172 its reverse (27102127), we get a palindrome (99222299).

The spelling of 72120172 in words is "seventy-two million, one hundred twenty thousand, one hundred seventy-two".