72731420 has 24 divisors (see below), whose sum is σ = 158004000. Its totient is φ = 28089152.

The previous prime is 72731387. The next prime is 72731441. The reversal of 72731420 is 2413727.

It is a self number, because there is not a number n which added to its sum of digits gives 72731420.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62120 + ... + 63279.

It is an arithmetic number, because the mean of its divisors is an integer number (6583500).

Almost surely, 2^72731420 is an apocalyptic number.

It is an amenable number.

72731420 is an abundant number, since it is smaller than the sum of its proper divisors (85272580).

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

72731420 is a wasteful number, since it uses less digits than its factorization.

72731420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125437 (or 125435 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 72731420 is about 8528.2718061750. The cubic root of 72731420 is about 417.4207386556.

The spelling of 72731420 in words is "seventy-two million, seven hundred thirty-one thousand, four hundred twenty".