15860864 has 64 divisors (see below), whose sum is σ = 34535160. Its totient is φ = 7225344.

The previous prime is 15860863. The next prime is 15860927. The reversal of 15860864 is 46806851.

It can be written as a sum of positive squares in 4 ways, for example, as 14440000 + 1420864 = 3800^2 + 1192^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (15860861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80414 + ... + 80610.

Almost surely, 2^15860864 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 15860864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17267580).

15860864 is an abundant number, since it is smaller than the sum of its proper divisors (18674296).

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

15860864 is a wasteful number, since it uses less digits than its factorization.

15860864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 15860864 is about 3982.5700244942. The cubic root of 15860864 is about 251.2516642217.

The spelling of 15860864 in words is "fifteen million, eight hundred sixty thousand, eight hundred sixty-four".