72730440 has 64 divisors (see below), whose sum is σ = 242438400. Its totient is φ = 19394496.

The previous prime is 72730409. The next prime is 72730457. The reversal of 72730440 is 4403727.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 32592 + ... + 34751.

It is an arithmetic number, because the mean of its divisors is an integer number (3788100).

Almost surely, 2^72730440 is an apocalyptic number.

It is an amenable number.

72730440 is an abundant number, since it is smaller than the sum of its proper divisors (169707960).

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

72730440 is a wasteful number, since it uses less digits than its factorization.

72730440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67363 (or 67353 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 72730440 is about 8528.2143500266. The cubic root of 72730440 is about 417.4188638392.

The spelling of 72730440 in words is "seventy-two million, seven hundred thirty thousand, four hundred forty".