12015564 has 48 divisors (see below), whose sum is σ = 30796416. Its totient is φ = 3616000.

The previous prime is 12015559. The next prime is 12015571. The reversal of 12015564 is 46551021.

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, 29764 + ... + 30164.

It is an arithmetic number, because the mean of its divisors is an integer number (641592).

Almost surely, 2^12015564 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 12015564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15398208).

12015564 is an abundant number, since it is smaller than the sum of its proper divisors (18780852).

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

12015564 is a wasteful number, since it uses less digits than its factorization.

12015564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 12015564 is about 3466.3473570893. The cubic root of 12015564 is about 229.0417853741.

Adding to 12015564 its reverse (46551021), we get a palindrome (58566585).

The spelling of 12015564 in words is "twelve million, fifteen thousand, five hundred sixty-four".