22664640 has 56 divisors (see below), whose sum is σ = 71963280. Its totient is φ = 6043648.

The previous prime is 22664623. The next prime is 22664641. The reversal of 22664640 is 4646622.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22664598 and 22664607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22664641) 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, 10845 + ... + 12764.

Almost surely, 2^22664640 is an apocalyptic number.

22664640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22664640 is an abundant number, since it is smaller than the sum of its proper divisors (49298640).

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

22664640 is a wasteful number, since it uses less digits than its factorization.

22664640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23629 (or 23619 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 22664640 is about 4760.7394383646. The cubic root of 22664640 is about 282.9977233478.

The spelling of 22664640 in words is "twenty-two million, six hundred sixty-four thousand, six hundred forty".