72881220 has 24 divisors (see below), whose sum is σ = 204067584. Its totient is φ = 19434976.

The previous prime is 72881219. The next prime is 72881233. The reversal of 72881220 is 2218827.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 607284 + ... + 607403.

It is an arithmetic number, because the mean of its divisors is an integer number (8502816).

Almost surely, 2^72881220 is an apocalyptic number.

It is an amenable number.

72881220 is an abundant number, since it is smaller than the sum of its proper divisors (131186364).

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

72881220 is a wasteful number, since it uses less digits than its factorization.

72881220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214699 (or 1214697 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 72881220 is about 8537.0498417193. The cubic root of 72881220 is about 417.7071199121.

The spelling of 72881220 in words is "seventy-two million, eight hundred eighty-one thousand, two hundred twenty".