638484980 has 48 divisors (see below), whose sum is σ = 1622509056. Its totient is φ = 206031360.

The previous prime is 638484953. The next prime is 638485033. The reversal of 638484980 is 89484836.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131756 + ... + 136515.

It is an arithmetic number, because the mean of its divisors is an integer number (33802272).

Almost surely, 2^638484980 is an apocalyptic number.

It is an amenable number.

638484980 is an abundant number, since it is smaller than the sum of its proper divisors (984024076).

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

638484980 is a wasteful number, since it uses less digits than its factorization.

638484980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268304 (or 268302 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 50.

The square root of 638484980 is about 25268.2603279292. The cubic root of 638484980 is about 861.0933363086.

The spelling of 638484980 in words is "six hundred thirty-eight million, four hundred eighty-four thousand, nine hundred eighty".