19890874648 has 16 divisors (see below), whose sum is σ = 37297250280. Its totient is φ = 9944941248.

The previous prime is 19890874643. The next prime is 19890874673. The reversal of 19890874648 is 84647809891.

It is a self number, because there is not a number n which added to its sum of digits gives 19890874648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19890874643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151740 + ... + 250612.

Almost surely, 2^19890874648 is an apocalyptic number.

It is an amenable number.

19890874648 is a deficient number, since it is larger than the sum of its proper divisors (17406375632).

19890874648 is a wasteful number, since it uses less digits than its factorization.

19890874648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124026 (or 124022 counting only the distinct ones).

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

The spelling of 19890874648 in words is "nineteen billion, eight hundred ninety million, eight hundred seventy-four thousand, six hundred forty-eight".