638056379758 has 8 divisors (see below), whose sum is σ = 1093810936752. Its totient is φ = 273452734176.

The previous prime is 638056379707. The next prime is 638056379761. The reversal of 638056379758 is 857973650836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×638056379758² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638056379693 and 638056379702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22787727835 + ... + 22787727862.

It is an arithmetic number, because the mean of its divisors is an integer number (136726367094).

Almost surely, 2^638056379758 is an apocalyptic number.

638056379758 is a deficient number, since it is larger than the sum of its proper divisors (455754556994).

638056379758 is a wasteful number, since it uses less digits than its factorization.

638056379758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45575455706.

The product of its (nonzero) digits is 228614400, while the sum is 67.

The spelling of 638056379758 in words is "six hundred thirty-eight billion, fifty-six million, three hundred seventy-nine thousand, seven hundred fifty-eight".