638469008 has 20 divisors (see below), whose sum is σ = 1302141360. Its totient is φ = 302432544.

The previous prime is 638468977. The next prime is 638469011. The reversal of 638469008 is 800964836.

It is a self number, because there is not a number n which added to its sum of digits gives 638469008.

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 3 ways as a sum of consecutive naturals, for example, 1049810 + ... + 1050417.

It is an arithmetic number, because the mean of its divisors is an integer number (65107068).

Almost surely, 2^638469008 is an apocalyptic number.

It is an amenable number.

638469008 is an abundant number, since it is smaller than the sum of its proper divisors (663672352).

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

638469008 is a wasteful number, since it uses less digits than its factorization.

638469008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100254 (or 2100248 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 638469008 is about 25267.9442772854. The cubic root of 638469008 is about 861.0861560314.

The spelling of 638469008 in words is "six hundred thirty-eight million, four hundred sixty-nine thousand, eight".