638285603388 has 24 divisors (see below), whose sum is σ = 1576940902992. Its totient is φ = 200246463744.

The previous prime is 638285603359. The next prime is 638285603447. The reversal of 638285603388 is 883306582836.

It is a super-2 number, since 2×638285603388² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1564425295 + ... + 1564425702.

It is an arithmetic number, because the mean of its divisors is an integer number (65705870958).

Almost surely, 2^638285603388 is an apocalyptic number.

638285603388 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

638285603388 is an abundant number, since it is smaller than the sum of its proper divisors (938655299604).

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

638285603388 is a wasteful number, since it uses less digits than its factorization.

638285603388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128851021 (or 3128851019 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 60.

The spelling of 638285603388 in words is "six hundred thirty-eight billion, two hundred eighty-five million, six hundred three thousand, three hundred eighty-eight".