12638106890 has 16 divisors (see below), whose sum is σ = 22833164520. Its totient is φ = 5036448960.

The previous prime is 12638106863. The next prime is 12638106913. The reversal of 12638106890 is 9860183621.

It can be written as a sum of positive squares in 4 ways, for example, as 5740638289 + 6897468601 = 75767^2 + 83051^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2346401 + ... + 2351780.

Almost surely, 2^12638106890 is an apocalyptic number.

12638106890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12638106890 is a deficient number, since it is larger than the sum of its proper divisors (10195057630).

12638106890 is a wasteful number, since it uses less digits than its factorization.

12638106890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698457.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 12638106890 in words is "twelve billion, six hundred thirty-eight million, one hundred six thousand, eight hundred ninety".