19864288972 has 48 divisors (see below), whose sum is σ = 38087159040. Its totient is φ = 8990177600.

The previous prime is 19864288957. The next prime is 19864288999. The reversal of 19864288972 is 27988246891.

It is a happy 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, 13145697 + ... + 13147207.

It is an arithmetic number, because the mean of its divisors is an integer number (793482480).

Almost surely, 2^19864288972 is an apocalyptic number.

It is an amenable number.

19864288972 is a deficient number, since it is larger than the sum of its proper divisors (18222870068).

19864288972 is a wasteful number, since it uses less digits than its factorization.

19864288972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622 (or 2620 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 64.

The spelling of 19864288972 in words is "nineteen billion, eight hundred sixty-four million, two hundred eighty-eight thousand, nine hundred seventy-two".