72051720 has 64 divisors (see below), whose sum is σ = 232787520. Its totient is φ = 17735424.

The previous prime is 72051671. The next prime is 72051737. The reversal of 72051720 is 2715027.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21534 + ... + 24653.

It is an arithmetic number, because the mean of its divisors is an integer number (3637305).

Almost surely, 2^72051720 is an apocalyptic number.

It is an amenable number.

72051720 is an abundant number, since it is smaller than the sum of its proper divisors (160735800).

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

72051720 is a wasteful number, since it uses less digits than its factorization.

72051720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46214 (or 46210 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 72051720 is about 8488.3284573584. The cubic root of 72051720 is about 416.1163536712.

Adding to 72051720 its reverse (2715027), we get a palindrome (74766747).

It can be divided in two parts, 72051 and 720, that added together give a triangular number (72771 = T₃₈₁).

The spelling of 72051720 in words is "seventy-two million, fifty-one thousand, seven hundred twenty".