72397856 has 24 divisors (see below), whose sum is σ = 143486784. Its totient is φ = 35956800.

The previous prime is 72397811. The next prime is 72397861. The reversal of 72397856 is 65879327.

It is a self number, because there is not a number n which added to its sum of digits gives 72397856.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2660 + ... + 12323.

It is an arithmetic number, because the mean of its divisors is an integer number (5978616).

Almost surely, 2^72397856 is an apocalyptic number.

It is an amenable number.

72397856 is a deficient number, since it is larger than the sum of its proper divisors (71088928).

72397856 is a wasteful number, since it uses less digits than its factorization.

72397856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15144 (or 15136 counting only the distinct ones).

The product of its digits is 635040, while the sum is 47.

The square root of 72397856 is about 8508.6929666077. The cubic root of 72397856 is about 416.7816295753.

The spelling of 72397856 in words is "seventy-two million, three hundred ninety-seven thousand, eight hundred fifty-six".