19400328668 has 48 divisors (see below), whose sum is σ = 42085116864. Its totient is φ = 7634472960.

The previous prime is 19400328653. The next prime is 19400328713. The reversal of 19400328668 is 86682300491.

It is a congruent 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, 477521 + ... + 516552.

It is an arithmetic number, because the mean of its divisors is an integer number (876773268).

Almost surely, 2^19400328668 is an apocalyptic number.

It is an amenable number.

19400328668 is an abundant number, since it is smaller than the sum of its proper divisors (22684788196).

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

19400328668 is a wasteful number, since it uses less digits than its factorization.

19400328668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994142 (or 994140 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 19400328668 in words is "nineteen billion, four hundred million, three hundred twenty-eight thousand, six hundred sixty-eight".