638792839080 has 256 divisors, whose sum is σ = 2327033318400. Its totient is φ = 154582191360.

The previous prime is 638792839073. The next prime is 638792839121. The reversal of 638792839080 is 80938297836.

638792839080 is a `hidden beast` number, since 6 + 3 + 87 + 92 + 8 + 390 + 80 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 638792838999 and 638792839017.

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 63 ways as a sum of consecutive naturals, for example, 6640687 + ... + 6736193.

It is an arithmetic number, because the mean of its divisors is an integer number (9089973900).

Almost surely, 2^638792839080 is an apocalyptic number.

638792839080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638792839080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1163516659200).

638792839080 is an abundant number, since it is smaller than the sum of its proper divisors (1688240479320).

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

638792839080 is a wasteful number, since it uses less digits than its factorization.

638792839080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96101 (or 96091 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 638792839080 in words is "six hundred thirty-eight billion, seven hundred ninety-two million, eight hundred thirty-nine thousand, eighty".