672216816 has 40 divisors (see below), whose sum is σ = 1737517264. Its totient is φ = 223948800.

The previous prime is 672216793. The next prime is 672216821. The reversal of 672216816 is 618612276.

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, 137616 + ... + 142416.

Almost surely, 2^672216816 is an apocalyptic number.

It is an amenable number.

672216816 is an abundant number, since it is smaller than the sum of its proper divisors (1065300448).

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

672216816 is a wasteful number, since it uses less digits than its factorization.

672216816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729 (or 7723 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 672216816 is about 25927.1443857591. The cubic root of 672216816 is about 875.9980192195.

The spelling of 672216816 in words is "six hundred seventy-two million, two hundred sixteen thousand, eight hundred sixteen".