15909128843872 has 48 divisors (see below), whose sum is σ = 34169110585344. Its totient is φ = 7231286608000.

The previous prime is 15909128843849. The next prime is 15909128843899. The reversal of 15909128843872 is 27834882190951.

It is a junction number, because it is equal to n+sod(n) for n = 15909128843798 and 15909128843807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19736097 + ... + 20526367.

It is an arithmetic number, because the mean of its divisors is an integer number (711856470528).

Almost surely, 2^{15909128843872} is an apocalyptic number.

It is an amenable number.

15909128843872 is an abundant number, since it is smaller than the sum of its proper divisors (18259981741472).

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

15909128843872 is a wasteful number, since it uses less digits than its factorization.

15909128843872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847483 (or 847475 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 67.

The spelling of 15909128843872 in words is "fifteen trillion, nine hundred nine billion, one hundred twenty-eight million, eight hundred forty-three thousand, eight hundred seventy-two".