638444848782 has 64 divisors (see below), whose sum is σ = 1432032731136. Its totient is φ = 188425198080.

The previous prime is 638444848781. The next prime is 638444848859. The reversal of 638444848782 is 287848444836.

It is a super-2 number, since 2×638444848782² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638444848781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 895078 + ... + 1441545.

It is an arithmetic number, because the mean of its divisors is an integer number (22375511424).

Almost surely, 2^638444848782 is an apocalyptic number.

638444848782 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

638444848782 is an abundant number, since it is smaller than the sum of its proper divisors (793587882354).

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

638444848782 is a wasteful number, since it uses less digits than its factorization.

638444848782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336785.

The product of its digits is 264241152, while the sum is 66.

The spelling of 638444848782 in words is "six hundred thirty-eight billion, four hundred forty-four million, eight hundred forty-eight thousand, seven hundred eighty-two".