72072920 has 16 divisors (see below), whose sum is σ = 162164160. Its totient is φ = 28829152.

The previous prime is 72072919. The next prime is 72072937. The reversal of 72072920 is 2927027.

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, 900872 + ... + 900951.

It is an arithmetic number, because the mean of its divisors is an integer number (10135260).

Almost surely, 2^72072920 is an apocalyptic number.

It is an amenable number.

72072920 is an abundant number, since it is smaller than the sum of its proper divisors (90091240).

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

72072920 is a wasteful number, since it uses less digits than its factorization.

72072920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801834 (or 1801830 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 72072920 is about 8489.5771390570. The cubic root of 72072920 is about 416.1571614023.

Adding to 72072920 its reverse (2927027), we get a palindrome (74999947).

The spelling of 72072920 in words is "seventy-two million, seventy-two thousand, nine hundred twenty".