638579480 has 64 divisors (see below), whose sum is σ = 1791348480. Its totient is φ = 199036800.

The previous prime is 638579477. The next prime is 638579489. The reversal of 638579480 is 84975836.

638579480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638579489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100586 + ... + 106745.

It is an arithmetic number, because the mean of its divisors is an integer number (27989820).

Almost surely, 2^638579480 is an apocalyptic number.

It is an amenable number.

638579480 is an abundant number, since it is smaller than the sum of its proper divisors (1152769000).

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

638579480 is a wasteful number, since it uses less digits than its factorization.

638579480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207360 (or 207356 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 638579480 is about 25270.1301935704. The cubic root of 638579480 is about 861.1358167159.

It can be divided in two parts, 63857 and 9480, that added together give a palindrome (73337).

The spelling of 638579480 in words is "six hundred thirty-eight million, five hundred seventy-nine thousand, four hundred eighty".