22865664 has 72 divisors (see below), whose sum is σ = 64099840. Its totient is φ = 7216128.

The previous prime is 22865651. The next prime is 22865669. The reversal of 22865664 is 46656822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22865669) 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, 13809 + ... + 15375.

Almost surely, 2^22865664 is an apocalyptic number.

22865664 is a gapful number since it is divisible by the number (24) 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 22865664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32049920).

22865664 is an abundant number, since it is smaller than the sum of its proper divisors (41234176).

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

22865664 is a wasteful number, since it uses less digits than its factorization.

22865664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605 (or 1591 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 22865664 is about 4781.8055167478. The cubic root of 22865664 is about 283.8319444803.

Adding to 22865664 its sum of digits (39), we get a triangular number (22865703 = T₆₇₆₂).

The spelling of 22865664 in words is "twenty-two million, eight hundred sixty-five thousand, six hundred sixty-four".