638052144 has 20 divisors (see below), whose sum is σ = 1648301496. Its totient is φ = 212684032.

The previous prime is 638052139. The next prime is 638052169. The reversal of 638052144 is 441250836.

It is a super-2 number, since 2×638052144² = 814221076925993472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6646329 + ... + 6646424.

Almost surely, 2^638052144 is an apocalyptic number.

It is an amenable number.

638052144 is an abundant number, since it is smaller than the sum of its proper divisors (1010249352).

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

638052144 is a wasteful number, since it uses less digits than its factorization.

638052144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13292764 (or 13292758 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 638052144 is about 25259.6940599050. The cubic root of 638052144 is about 860.8987107702.

The spelling of 638052144 in words is "six hundred thirty-eight million, fifty-two thousand, one hundred forty-four".