72122720 has 24 divisors (see below), whose sum is σ = 170390304. Its totient is φ = 28849024.

The previous prime is 72122719. The next prime is 72122761. The reversal of 72122720 is 2722127.

It is a congruent number.

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, 225224 + ... + 225543.

It is an arithmetic number, because the mean of its divisors is an integer number (7099596).

Almost surely, 2^72122720 is an apocalyptic number.

It is an amenable number.

72122720 is an abundant number, since it is smaller than the sum of its proper divisors (98267584).

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

72122720 is a wasteful number, since it uses less digits than its factorization.

72122720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450782 (or 450774 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 72122720 is about 8492.5096408541. The cubic root of 72122720 is about 416.2529896048.

Adding to 72122720 its reverse (2722127), we get a palindrome (74844847).

The spelling of 72122720 in words is "seventy-two million, one hundred twenty-two thousand, seven hundred twenty".