638485552 has 20 divisors (see below), whose sum is σ = 1240641576. Its totient is φ = 318320000.

The previous prime is 638485513. The next prime is 638485571. The reversal of 638485552 is 255584836.

It is a super-2 number, since 2×638485552² = 815327600225489408, 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, 51949 + ... + 63052.

Almost surely, 2^638485552 is an apocalyptic number.

It is an amenable number.

638485552 is a deficient number, since it is larger than the sum of its proper divisors (602156024).

638485552 is a wasteful number, since it uses less digits than its factorization.

638485552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115356 (or 115350 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 46.

The square root of 638485552 is about 25268.2716464740. The cubic root of 638485552 is about 861.0935934513.

The spelling of 638485552 in words is "six hundred thirty-eight million, four hundred eighty-five thousand, five hundred fifty-two".