19646879472 has 240 divisors, whose sum is σ = 63740027520. Its totient is φ = 5586624000.

The previous prime is 19646879471. The next prime is 19646879501. The reversal of 19646879472 is 27497864691.

19646879472 is a `hidden beast` number, since 1 + 96 + 4 + 6 + 8 + 79 + 472 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19646879471) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3217222 + ... + 3223322.

It is an arithmetic number, because the mean of its divisors is an integer number (265583448).

Almost surely, 2^19646879472 is an apocalyptic number.

19646879472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19646879472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31870013760).

19646879472 is an abundant number, since it is smaller than the sum of its proper divisors (44093148048).

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

19646879472 is a wasteful number, since it uses less digits than its factorization.

19646879472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6252 (or 6243 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 19646879472 in words is "nineteen billion, six hundred forty-six million, eight hundred seventy-nine thousand, four hundred seventy-two".