15664968 has 128 divisors (see below), whose sum is σ = 50112000. Its totient is φ = 4484160.

The previous prime is 15664967. The next prime is 15665009. The reversal of 15664968 is 86946651.

15664968 is a `hidden beast` number, since 156 + 6 + 496 + 8 = 666.

15664968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (15664963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44971 + ... + 45317.

It is an arithmetic number, because the mean of its divisors is an integer number (391500).

Almost surely, 2^15664968 is an apocalyptic number.

15664968 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 15664968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25056000).

15664968 is an abundant number, since it is smaller than the sum of its proper divisors (34447032).

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

15664968 is a wasteful number, since it uses less digits than its factorization.

15664968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 382 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 15664968 is about 3957.8994428863. The cubic root of 15664968 is about 250.2129811712.

The spelling of 15664968 in words is "fifteen million, six hundred sixty-four thousand, nine hundred sixty-eight".