638377270056 has 96 divisors (see below), whose sum is σ = 1771402932000. Its totient is φ = 207610895232.

The previous prime is 638377270049. The next prime is 638377270081. The reversal of 638377270056 is 650072773836.

It is a junction number, because it is equal to n+sod(n) for n = 638377269984 and 638377270011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215775 + ... + 1150353.

It is an arithmetic number, because the mean of its divisors is an integer number (18452113875).

Almost surely, 2^638377270056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638377270056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (885701466000).

638377270056 is an abundant number, since it is smaller than the sum of its proper divisors (1133025661944).

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

638377270056 is a wasteful number, since it uses less digits than its factorization.

638377270056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934823 (or 934816 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 54.

The spelling of 638377270056 in words is "six hundred thirty-eight billion, three hundred seventy-seven million, two hundred seventy thousand, fifty-six".