638379288 has 48 divisors (see below), whose sum is σ = 1737758880. Its totient is φ = 211708224.

The previous prime is 638379199. The next prime is 638379293. The reversal of 638379288 is 882973836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8320 + ... + 36687.

It is an arithmetic number, because the mean of its divisors is an integer number (36203310).

Almost surely, 2^638379288 is an apocalyptic number.

It is an amenable number.

638379288 is an abundant number, since it is smaller than the sum of its proper divisors (1099379592).

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

638379288 is a wasteful number, since it uses less digits than its factorization.

638379288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45216 (or 45209 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 638379288 is about 25266.1688429409. The cubic root of 638379288 is about 861.0458198167.

The spelling of 638379288 in words is "six hundred thirty-eight million, three hundred seventy-nine thousand, two hundred eighty-eight".