19390478672 has 40 divisors (see below), whose sum is σ = 39606131712. Its totient is φ = 9182851200.

The previous prime is 19390478659. The next prime is 19390478699. The reversal of 19390478672 is 27687409391.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392579 + ... + 439202.

Almost surely, 2^19390478672 is an apocalyptic number.

It is an amenable number.

19390478672 is an abundant number, since it is smaller than the sum of its proper divisors (20215653040).

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

19390478672 is a wasteful number, since it uses less digits than its factorization.

19390478672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831867 (or 831861 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 19390478672 in words is "nineteen billion, three hundred ninety million, four hundred seventy-eight thousand, six hundred seventy-two".