72813868 has 12 divisors (see below), whose sum is σ = 130532472. Its totient is φ = 35518880.

The previous prime is 72813863. The next prime is 72813869. The reversal of 72813868 is 86831827.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (72813863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221830 + ... + 222157.

It is an arithmetic number, because the mean of its divisors is an integer number (10877706).

Almost surely, 2^72813868 is an apocalyptic number.

It is an amenable number.

72813868 is a deficient number, since it is larger than the sum of its proper divisors (57718604).

72813868 is a wasteful number, since it uses less digits than its factorization.

72813868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444032 (or 444030 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 72813868 is about 8533.1042417165. The cubic root of 72813868 is about 417.5784078299.

The spelling of 72813868 in words is "seventy-two million, eight hundred thirteen thousand, eight hundred sixty-eight".