12638220380 has 12 divisors (see below), whose sum is σ = 26540262840. Its totient is φ = 5055288144.

The previous prime is 12638220373. The next prime is 12638220403. The reversal of 12638220380 is 8302283621.

It is a super-2 number, since 2×12638220380² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12638220380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315955490 + ... + 315955529.

It is an arithmetic number, because the mean of its divisors is an integer number (2211688570).

Almost surely, 2^12638220380 is an apocalyptic number.

12638220380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12638220380 is an abundant number, since it is smaller than the sum of its proper divisors (13902042460).

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

12638220380 is a wasteful number, since it uses less digits than its factorization.

12638220380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631911028 (or 631911026 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 12638220380 in words is "twelve billion, six hundred thirty-eight million, two hundred twenty thousand, three hundred eighty".