19640944904 has 32 divisors (see below), whose sum is σ = 42092265600. Its totient is φ = 8416642560.

The previous prime is 19640944903. The next prime is 19640944907. The reversal of 19640944904 is 40944904691.

It is a Smith number, since the sum of its digits (50) 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 (19640944903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920792 + ... + 941880.

It is an arithmetic number, because the mean of its divisors is an integer number (1315383300).

Almost surely, 2^19640944904 is an apocalyptic number.

19640944904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19640944904 is an abundant number, since it is smaller than the sum of its proper divisors (22451320696).

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

19640944904 is a wasteful number, since it uses less digits than its factorization.

19640944904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37733 (or 37729 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 19640944904 in words is "nineteen billion, six hundred forty million, nine hundred forty-four thousand, nine hundred four".