15561264 has 40 divisors (see below), whose sum is σ = 40759792. Its totient is φ = 5114880.

The previous prime is 15561253. The next prime is 15561281. The reversal of 15561264 is 46216551.

15561264 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1284 + ... + 5724.

Almost surely, 2^15561264 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 15561264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20379896).

15561264 is an abundant number, since it is smaller than the sum of its proper divisors (25198528).

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

15561264 is a wasteful number, since it uses less digits than its factorization.

15561264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4525 (or 4519 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 15561264 is about 3944.7767997695. The cubic root of 15561264 is about 249.6596114195.

The spelling of 15561264 in words is "fifteen million, five hundred sixty-one thousand, two hundred sixty-four".