72168856 has 32 divisors (see below), whose sum is σ = 140928480. Its totient is φ = 34617600.

The previous prime is 72168823. The next prime is 72168857. The reversal of 72168856 is 65886127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72168857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18205 + ... + 21811.

It is an arithmetic number, because the mean of its divisors is an integer number (4404015).

Almost surely, 2^72168856 is an apocalyptic number.

It is an amenable number.

72168856 is a deficient number, since it is larger than the sum of its proper divisors (68759624).

72168856 is a wasteful number, since it uses less digits than its factorization.

72168856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715 (or 3711 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 72168856 is about 8495.2254825873. The cubic root of 72168856 is about 416.3417279593.

The spelling of 72168856 in words is "seventy-two million, one hundred sixty-eight thousand, eight hundred fifty-six".