19879742460 has 24 divisors (see below), whose sum is σ = 55663279056. Its totient is φ = 5301264640.

The previous prime is 19879742381. The next prime is 19879742473. The reversal of 19879742460 is 6424797891.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19879742460.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165664461 + ... + 165664580.

It is an arithmetic number, because the mean of its divisors is an integer number (2319303294).

Almost surely, 2^19879742460 is an apocalyptic number.

19879742460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19879742460 is an abundant number, since it is smaller than the sum of its proper divisors (35783536596).

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

19879742460 is a wasteful number, since it uses less digits than its factorization.

19879742460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331329053 (or 331329051 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 57.

The spelling of 19879742460 in words is "nineteen billion, eight hundred seventy-nine million, seven hundred forty-two thousand, four hundred sixty".