13215616 has 48 divisors (see below), whose sum is σ = 27888840. Its totient is φ = 6226176.

The previous prime is 13215607. The next prime is 13215617. The reversal of 13215616 is 61651231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 197215 + ... + 197281.

Almost surely, 2^13215616 is an apocalyptic number.

13215616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13215616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13944420).

13215616 is an abundant number, since it is smaller than the sum of its proper divisors (14673224).

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

13215616 is an frugal number, since it uses more digits than its factorization.

13215616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 92 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 13215616 is about 3635.3288709551. The cubic root of 13215616 is about 236.4263097923.

Adding to 13215616 its reverse (61651231), we get a palindrome (74866847).

It can be divided in two parts, 13215 and 616, that added together give a palindrome (13831).

The spelling of 13215616 in words is "thirteen million, two hundred fifteen thousand, six hundred sixteen".