638580884220 has 60 divisors (see below), whose sum is σ = 2003251890024. Its totient is φ = 170288235360.

The previous prime is 638580884189. The next prime is 638580884243. The reversal of 638580884220 is 22488085836.

638580884220 is a `hidden beast` number, since 6 + 38 + 580 + 8 + 8 + 4 + 2 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 197091246 + ... + 197094485.

Almost surely, 2^638580884220 is an apocalyptic number.

638580884220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638580884220 is an abundant number, since it is smaller than the sum of its proper divisors (1364671005804).

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

638580884220 is a wasteful number, since it uses less digits than its factorization.

638580884220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394185752 (or 394185741 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 54.

The spelling of 638580884220 in words is "six hundred thirty-eight billion, five hundred eighty million, eight hundred eighty-four thousand, two hundred twenty".