12638890212 has 96 divisors (see below), whose sum is σ = 33576117120. Its totient is φ = 3668198400.

The previous prime is 12638890211. The next prime is 12638890219. The reversal of 12638890212 is 21209883621.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (12638890211) 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, 681462 + ... + 699762.

It is an arithmetic number, because the mean of its divisors is an integer number (349751220).

Almost surely, 2^12638890212 is an apocalyptic number.

12638890212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12638890212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16788058560).

12638890212 is an abundant number, since it is smaller than the sum of its proper divisors (20937226908).

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

12638890212 is a wasteful number, since it uses less digits than its factorization.

12638890212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18573 (or 18571 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 12638890212 in words is "twelve billion, six hundred thirty-eight million, eight hundred ninety thousand, two hundred twelve".