15871128992 has 48 divisors (see below), whose sum is σ = 32128283880. Its totient is φ = 7714317312.

The previous prime is 15871128979. The next prime is 15871129049. The reversal of 15871128992 is 29982117851.

It can be written as a sum of positive squares in 4 ways, for example, as 15189083536 + 682045456 = 123244^2 + 26116^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

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, 141938 + ... + 227790.

Almost surely, 2^15871128992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15871128992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16064141940).

15871128992 is an abundant number, since it is smaller than the sum of its proper divisors (16257154888).

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

15871128992 is a wasteful number, since it uses less digits than its factorization.

15871128992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86025 (or 86017 counting only the distinct ones).

The product of its digits is 725760, while the sum is 53.

The spelling of 15871128992 in words is "fifteen billion, eight hundred seventy-one million, one hundred twenty-eight thousand, nine hundred ninety-two".