15552216 has 64 divisors (see below), whose sum is σ = 43740000. Its totient is φ = 5119488.

The previous prime is 15552191. The next prime is 15552217. The reversal of 15552216 is 61225551.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 15552216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15552217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18820 + ... + 19628.

Almost surely, 2^15552216 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 15552216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21870000).

15552216 is an abundant number, since it is smaller than the sum of its proper divisors (28187784).

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

15552216 is a wasteful number, since it uses less digits than its factorization.

15552216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 903 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 15552216 is about 3943.6298000700. The cubic root of 15552216 is about 249.6112143630.

Adding to 15552216 its reverse (61225551), we get a palindrome (76777767).

The spelling of 15552216 in words is "fifteen million, five hundred fifty-two thousand, two hundred sixteen".