15981728 has 24 divisors (see below), whose sum is σ = 35959392. Its totient is φ = 6849216.

The previous prime is 15981727. The next prime is 15981737. The reversal of 15981728 is 82718951.

It is not an unprimeable number, because it can be changed into a prime (15981727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35450 + ... + 35897.

It is an arithmetic number, because the mean of its divisors is an integer number (1498308).

Almost surely, 2^15981728 is an apocalyptic number.

It is an amenable number.

15981728 is an abundant number, since it is smaller than the sum of its proper divisors (19977664).

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

15981728 is an equidigital number, since it uses as much as digits as its factorization.

15981728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71364 (or 71356 counting only the distinct ones).

The product of its digits is 40320, while the sum is 41.

The square root of 15981728 is about 3997.7153475454. The cubic root of 15981728 is about 251.8882514522. Note that the first 3 decimals are identical.

The spelling of 15981728 in words is "fifteen million, nine hundred eighty-one thousand, seven hundred twenty-eight".