22815216 has 40 divisors (see below), whose sum is σ = 65489360. Its totient is φ = 7604928.

The previous prime is 22815209. The next prime is 22815217. The reversal of 22815216 is 61251822.

It is a happy number.

It is a super-2 number, since 2×22815216² = 1041068162253312, which contains 22 as substring.

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 22815216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22815217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25975 + ... + 26838.

It is an arithmetic number, because the mean of its divisors is an integer number (1637234).

Almost surely, 2^22815216 is an apocalyptic number.

It is an amenable number.

22815216 is an abundant number, since it is smaller than the sum of its proper divisors (42674144).

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

22815216 is a wasteful number, since it uses less digits than its factorization.

22815216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52830 (or 52818 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 22815216 is about 4776.5276090482. The cubic root of 22815216 is about 283.6230534367.

The spelling of 22815216 in words is "twenty-two million, eight hundred fifteen thousand, two hundred sixteen".