19864636790 has 32 divisors (see below), whose sum is σ = 36367682400. Its totient is φ = 7811103744.

The previous prime is 19864636789. The next prime is 19864636811. The reversal of 19864636790 is 9763646891.

It is a happy number.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75809 + ... + 213251.

It is an arithmetic number, because the mean of its divisors is an integer number (1136490075).

Almost surely, 2^19864636790 is an apocalyptic number.

19864636790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19864636790 is a deficient number, since it is larger than the sum of its proper divisors (16503045610).

19864636790 is a wasteful number, since it uses less digits than its factorization.

19864636790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137696.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 19864636790 in words is "nineteen billion, eight hundred sixty-four million, six hundred thirty-six thousand, seven hundred ninety".