15328721857990 has 16 divisors (see below), whose sum is σ = 27767442655152. Its totient is φ = 6092434674144.

The previous prime is 15328721857973. The next prime is 15328721857991. The reversal of 15328721857990 is 9975812782351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15328721857991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4881756984 + ... + 4881760123.

It is an arithmetic number, because the mean of its divisors is an integer number (1735465165947).

Almost surely, 2^{15328721857990} is an apocalyptic number.

15328721857990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15328721857990 is a deficient number, since it is larger than the sum of its proper divisors (12438720797162).

15328721857990 is a wasteful number, since it uses less digits than its factorization.

15328721857990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9763517271.

The product of its (nonzero) digits is 76204800, while the sum is 67.

The spelling of 15328721857990 in words is "fifteen trillion, three hundred twenty-eight billion, seven hundred twenty-one million, eight hundred fifty-seven thousand, nine hundred ninety".