638738552 has 48 divisors (see below), whose sum is σ = 1277169120. Its totient is φ = 299417600.

The previous prime is 638738521. The next prime is 638738579. The reversal of 638738552 is 255837836.

It is a super-2 number, since 2×638738552² = 815973875622113408, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638738497 and 638738506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 996152 + ... + 996792.

It is an arithmetic number, because the mean of its divisors is an integer number (26607690).

Almost surely, 2^638738552 is an apocalyptic number.

It is an amenable number.

638738552 is a deficient number, since it is larger than the sum of its proper divisors (638430568).

638738552 is a wasteful number, since it uses less digits than its factorization.

638738552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1091 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The square root of 638738552 is about 25273.2774289367. The cubic root of 638738552 is about 861.2073145891.

The spelling of 638738552 in words is "six hundred thirty-eight million, seven hundred thirty-eight thousand, five hundred fifty-two".