15664044 has 48 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 4655040.

The previous prime is 15664043. The next prime is 15664067. The reversal of 15664044 is 44046651.

It is not an unprimeable number, because it can be changed into a prime (15664043) 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 15 ways as a sum of consecutive naturals, for example, 5877 + ... + 8115.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^15664044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15664044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20321280).

15664044 is an abundant number, since it is smaller than the sum of its proper divisors (24978516).

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

15664044 is a wasteful number, since it uses less digits than its factorization.

15664044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310 (or 2308 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 15664044 is about 3957.7827125804. The cubic root of 15664044 is about 250.2080614603.

The spelling of 15664044 in words is "fifteen million, six hundred sixty-four thousand, forty-four".