672815808 has 140 divisors (see below), whose sum is σ = 2279479312. Its totient is φ = 192222720.

The previous prime is 672815789. The next prime is 672815833. The reversal of 672815808 is 808518276.

672815808 is a `hidden beast` number, since 67 + 2 + 8 + 1 + 580 + 8 = 666.

It is a super-2 number, since 2×672815808² = 905362222989385728, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27018 + ... + 45558.

Almost surely, 2^672815808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 672815808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1139739656).

672815808 is an abundant number, since it is smaller than the sum of its proper divisors (1606663504).

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

672815808 is a wasteful number, since it uses less digits than its factorization.

672815808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18572 (or 18553 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The square root of 672815808 is about 25938.6932592989. The cubic root of 672815808 is about 876.2581337229.

The spelling of 672815808 in words is "six hundred seventy-two million, eight hundred fifteen thousand, eight hundred eight".