72371220 has 24 divisors (see below), whose sum is σ = 202639584. Its totient is φ = 19298976.

The previous prime is 72371213. The next prime is 72371231. The reversal of 72371220 is 2217327.

It is a congruent number.

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, 603034 + ... + 603153.

It is an arithmetic number, because the mean of its divisors is an integer number (8443316).

Almost surely, 2^72371220 is an apocalyptic number.

It is an amenable number.

72371220 is an abundant number, since it is smaller than the sum of its proper divisors (130268364).

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

72371220 is a wasteful number, since it uses less digits than its factorization.

72371220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206199 (or 1206197 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 72371220 is about 8507.1275998424. The cubic root of 72371220 is about 416.7305103948.

Adding to 72371220 its reverse (2217327), we get a palindrome (74588547).

The spelling of 72371220 in words is "seventy-two million, three hundred seventy-one thousand, two hundred twenty".