19729313868 has 48 divisors (see below), whose sum is σ = 50520847104. Its totient is φ = 5942773440.

The previous prime is 19729313837. The next prime is 19729313873. The reversal of 19729313868 is 86831392791.

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, 425455 + ... + 469542.

It is an arithmetic number, because the mean of its divisors is an integer number (1052517648).

Almost surely, 2^19729313868 is an apocalyptic number.

It is an amenable number.

19729313868 is an abundant number, since it is smaller than the sum of its proper divisors (30791533236).

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

19729313868 is a wasteful number, since it uses less digits than its factorization.

19729313868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895182 (or 895180 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The spelling of 19729313868 in words is "nineteen billion, seven hundred twenty-nine million, three hundred thirteen thousand, eight hundred sixty-eight".