19891488272 has 20 divisors (see below), whose sum is σ = 39782977536. Its totient is φ = 9624913440.

The previous prime is 19891488263. The next prime is 19891488301. The reversal of 19891488272 is 27288419891.

19891488272 is an admirable number.

It is a super-2 number, since 2×19891488272² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20051408 + ... + 20052399.

Almost surely, 2^19891488272 is an apocalyptic number.

It is an amenable number.

19891488272 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19891488272 is a wasteful number, since it uses less digits than its factorization.

19891488272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40103846 (or 40103840 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 59.

The spelling of 19891488272 in words is "nineteen billion, eight hundred ninety-one million, four hundred eighty-eight thousand, two hundred seventy-two".