15664536 has 64 divisors (see below), whose sum is σ = 44467200. Its totient is φ = 5107104.

The previous prime is 15664529. The next prime is 15664547. The reversal of 15664536 is 63546651.

15664536 is a `hidden beast` number, since 1 + 5 + 6 + 645 + 3 + 6 = 666.

15664536 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 15664536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9381 + ... + 10923.

It is an arithmetic number, because the mean of its divisors is an integer number (694800).

Almost surely, 2^15664536 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 15664536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22233600).

15664536 is an abundant number, since it is smaller than the sum of its proper divisors (28802664).

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

15664536 is a wasteful number, since it uses less digits than its factorization.

15664536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605 (or 1595 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 15664536 is about 3957.8448681069. The cubic root of 15664536 is about 250.2106810707.

The spelling of 15664536 in words is "fifteen million, six hundred sixty-four thousand, five hundred thirty-six".