71388816 has 40 divisors (see below), whose sum is σ = 184791744. Its totient is φ = 23748480.

The previous prime is 71388809. The next prime is 71388829. The reversal of 71388816 is 61888317.

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, 29110 + ... + 31466.

Almost surely, 2^71388816 is an apocalyptic number.

It is an amenable number.

71388816 is an abundant number, since it is smaller than the sum of its proper divisors (113402928).

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

71388816 is a wasteful number, since it uses less digits than its factorization.

71388816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999 (or 2993 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 71388816 is about 8449.1902570601. The cubic root of 71388816 is about 414.8362754754.

The spelling of 71388816 in words is "seventy-one million, three hundred eighty-eight thousand, eight hundred sixteen".