19809147072 has 672 divisors, whose sum is σ = 68540497920. Its totient is φ = 4981616640.

The previous prime is 19809147047. The next prime is 19809147097. The reversal of 19809147072 is 27074190891.

It is an interprime number because it is at equal distance from previous prime (19809147047) and next prime (19809147097).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 155977473 + ... + 155977599.

Almost surely, 2^19809147072 is an apocalyptic number.

19809147072 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 19809147072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34270248960).

19809147072 is an abundant number, since it is smaller than the sum of its proper divisors (48731350848).

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

19809147072 is a wasteful number, since it uses less digits than its factorization.

19809147072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 48.

The spelling of 19809147072 in words is "nineteen billion, eight hundred nine million, one hundred forty-seven thousand, seventy-two".