72481720 has 32 divisors (see below), whose sum is σ = 168347520. Its totient is φ = 28056960.

The previous prime is 72481711. The next prime is 72481757. The reversal of 72481720 is 2718427.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 27987 + ... + 30466.

It is an arithmetic number, because the mean of its divisors is an integer number (5260860).

Almost surely, 2^72481720 is an apocalyptic number.

It is an amenable number.

72481720 is an abundant number, since it is smaller than the sum of its proper divisors (95865800).

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

72481720 is a wasteful number, since it uses less digits than its factorization.

72481720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58495 (or 58491 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 72481720 is about 8513.6196767298. The cubic root of 72481720 is about 416.9424975391.

The spelling of 72481720 in words is "seventy-two million, four hundred eighty-one thousand, seven hundred twenty".