72581916 has 24 divisors (see below), whose sum is σ = 184754304. Its totient is φ = 21994480.

The previous prime is 72581909. The next prime is 72581939. The reversal of 72581916 is 61918527.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274800 + ... + 275063.

It is an arithmetic number, because the mean of its divisors is an integer number (7698096).

Almost surely, 2^72581916 is an apocalyptic number.

It is an amenable number.

72581916 is an abundant number, since it is smaller than the sum of its proper divisors (112172388).

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

72581916 is a wasteful number, since it uses less digits than its factorization.

72581916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549881 (or 549879 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 72581916 is about 8519.5020981276. The cubic root of 72581916 is about 417.1345309484.

The spelling of 72581916 in words is "seventy-two million, five hundred eighty-one thousand, nine hundred sixteen".