15981768 has 96 divisors (see below), whose sum is σ = 50038560. Its totient is φ = 4554240.

The previous prime is 15981737. The next prime is 15981769. The reversal of 15981768 is 86718951.

It is not an unprimeable number, because it can be changed into a prime (15981769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12871 + ... + 14057.

It is an arithmetic number, because the mean of its divisors is an integer number (521235).

Almost surely, 2^15981768 is an apocalyptic number.

15981768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15981768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25019280).

15981768 is an abundant number, since it is smaller than the sum of its proper divisors (34056792).

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

15981768 is a wasteful number, since it uses less digits than its factorization.

15981768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227 (or 1220 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 15981768 is about 3997.7203503997. The cubic root of 15981768 is about 251.8884615989. Note that the first 3 decimals are identical.

The spelling of 15981768 in words is "fifteen million, nine hundred eighty-one thousand, seven hundred sixty-eight".