638722127578068 has 48 divisors (see below), whose sum is σ = 1657213239648960. Its totient is φ = 212744478049632.

The previous prime is 638722127578037. The next prime is 638722127578079. The reversal of 638722127578068 is 860875721227836.

638722127578068 is a `hidden beast` number, since 6 + 3 + 8 + 7 + 2 + 21 + 27 + 578 + 0 + 6 + 8 = 666.

It is a super-2 number, since 2×638722127578068² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638722127577987 and 638722127578005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2262327771 + ... + 2262610082.

It is an arithmetic number, because the mean of its divisors is an integer number (34525275826020).

Almost surely, 2^{638722127578068} is an apocalyptic number.

It is an amenable number.

638722127578068 is an abundant number, since it is smaller than the sum of its proper divisors (1018491112070892).

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

638722127578068 is a wasteful number, since it uses less digits than its factorization.

638722127578068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524939173 (or 4524939165 counting only the distinct ones).

The product of its (nonzero) digits is 758661120, while the sum is 72.

The spelling of 638722127578068 in words is "six hundred thirty-eight trillion, seven hundred twenty-two billion, one hundred twenty-seven million, five hundred seventy-eight thousand, sixty-eight".