638886554364 has 48 divisors (see below), whose sum is σ = 1535023300608. Its totient is φ = 206665386048.

The previous prime is 638886554347. The next prime is 638886554387. The reversal of 638886554364 is 463455688836.

It is a junction number, because it is equal to n+sod(n) for n = 638886554295 and 638886554304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1708452 + ... + 2048555.

It is an arithmetic number, because the mean of its divisors is an integer number (31979652096).

Almost surely, 2^638886554364 is an apocalyptic number.

It is an amenable number.

638886554364 is an abundant number, since it is smaller than the sum of its proper divisors (896136746244).

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

638886554364 is a wasteful number, since it uses less digits than its factorization.

638886554364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757434 (or 3757432 counting only the distinct ones).

The product of its digits is 398131200, while the sum is 66.

The spelling of 638886554364 in words is "six hundred thirty-eight billion, eight hundred eighty-six million, five hundred fifty-four thousand, three hundred sixty-four".