638153112 has 64 divisors (see below), whose sum is σ = 1623283200. Its totient is φ = 209018880.

The previous prime is 638153099. The next prime is 638153137. The reversal of 638153112 is 211351836.

It is a self number, because there is not a number n which added to its sum of digits gives 638153112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 829464 + ... + 830232.

It is an arithmetic number, because the mean of its divisors is an integer number (25363800).

Almost surely, 2^638153112 is an apocalyptic number.

It is an amenable number.

638153112 is an abundant number, since it is smaller than the sum of its proper divisors (985130088).

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

638153112 is a wasteful number, since it uses less digits than its factorization.

638153112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 1332 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 638153112 is about 25261.6925798728. The cubic root of 638153112 is about 860.9441190947.

The spelling of 638153112 in words is "six hundred thirty-eight million, one hundred fifty-three thousand, one hundred twelve".