15663216 has 40 divisors (see below), whose sum is σ = 40711680. Its totient is φ = 5189056.

The previous prime is 15663211. The next prime is 15663217. The reversal of 15663216 is 61236651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15663211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7681 + ... + 9503.

It is an arithmetic number, because the mean of its divisors is an integer number (1017792).

Almost surely, 2^15663216 is an apocalyptic number.

15663216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15663216 is an abundant number, since it is smaller than the sum of its proper divisors (25048464).

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

15663216 is a wasteful number, since it uses less digits than its factorization.

15663216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013 (or 2007 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 15663216 is about 3957.6781071734. The cubic root of 15663216 is about 250.2036527239.

Adding to 15663216 its reverse (61236651), we get a palindrome (76899867).

The spelling of 15663216 in words is "fifteen million, six hundred sixty-three thousand, two hundred sixteen".