900639808 has 28 divisors (see below), whose sum is σ = 1793344140. Its totient is φ = 448773632.

The previous prime is 900639793. The next prime is 900639809. The reversal of 900639808 is 808936009.

It can be written as a sum of positive squares in 2 ways, for example, as 681836544 + 218803264 = 26112^2 + 14792^2 .

It is a super-2 number, since 2×900639808² = 1622304127508553728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (900639809) 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, 5263 + ... + 42766.

It is an arithmetic number, because the mean of its divisors is an integer number (64048005).

Almost surely, 2^900639808 is an apocalyptic number.

It is an amenable number.

900639808 is a deficient number, since it is larger than the sum of its proper divisors (892704332).

900639808 is a wasteful number, since it uses less digits than its factorization.

900639808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48334 (or 48324 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 900639808 is about 30010.6615721813. The cubic root of 900639808 is about 965.7181184980.

The spelling of 900639808 in words is "nine hundred million, six hundred thirty-nine thousand, eight hundred eight".