15664242 has 64 divisors (see below), whose sum is σ = 37822464. Its totient is φ = 4266240.

The previous prime is 15664237. The next prime is 15664249. The reversal of 15664242 is 24246651.

15664242 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 (15664249) 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, 25503 + ... + 26109.

It is an arithmetic number, because the mean of its divisors is an integer number (590976).

Almost surely, 2^15664242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15664242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18911232).

15664242 is an abundant number, since it is smaller than the sum of its proper divisors (22158222).

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

15664242 is a wasteful number, since it uses less digits than its factorization.

15664242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663.

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

The square root of 15664242 is about 3957.8077265072. The cubic root of 15664242 is about 250.2091157004.

The spelling of 15664242 in words is "fifteen million, six hundred sixty-four thousand, two hundred forty-two".