19312722870 has 128 divisors (see below), whose sum is σ = 54385081344. Its totient is φ = 4297273344.

The previous prime is 19312722799. The next prime is 19312722893. The reversal of 19312722870 is 7822721391.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2822974 + ... + 2829806.

It is an arithmetic number, because the mean of its divisors is an integer number (424883448).

Almost surely, 2^19312722870 is an apocalyptic number.

19312722870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19312722870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27192540672).

19312722870 is an abundant number, since it is smaller than the sum of its proper divisors (35072358474).

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

19312722870 is a wasteful number, since it uses less digits than its factorization.

19312722870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7206.

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 19312722870 in words is "nineteen billion, three hundred twelve million, seven hundred twenty-two thousand, eight hundred seventy".