13215564 has 54 divisors (see below), whose sum is σ = 35419020. Its totient is φ = 4143312.

The previous prime is 13215541. The next prime is 13215569. The reversal of 13215564 is 46551231.

13215564 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 super-2 number, since 2×13215564² = 349302263676192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13215569) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 95007 + ... + 95145.

Almost surely, 2^13215564 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 13215564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17709510).

13215564 is an abundant number, since it is smaller than the sum of its proper divisors (22203456).

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

13215564 is a wasteful number, since it uses less digits than its factorization.

13215564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 163 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 13215564 is about 3635.3217189129. The cubic root of 13215564 is about 236.4259996999.

Adding to 13215564 its reverse (46551231), we get a palindrome (59766795).

The spelling of 13215564 in words is "thirteen million, two hundred fifteen thousand, five hundred sixty-four".