638862004056 has 32 divisors (see below), whose sum is σ = 1666596533760. Its totient is φ = 203695131552.

The previous prime is 638862004051. The next prime is 638862004063. The reversal of 638862004056 is 650400268836.

638862004056 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×638862004056² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638862003996 and 638862004014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638862004051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578678800 + ... + 578679903.

It is an arithmetic number, because the mean of its divisors is an integer number (52081141680).

Almost surely, 2^638862004056 is an apocalyptic number.

It is an amenable number.

638862004056 is an abundant number, since it is smaller than the sum of its proper divisors (1027734529704).

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

638862004056 is a wasteful number, since it uses less digits than its factorization.

638862004056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157358735 (or 1157358731 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 638862004056 in words is "six hundred thirty-eight billion, eight hundred sixty-two million, four thousand, fifty-six".