22564638720 has 832 divisors, whose sum is σ = 89610850560. Its totient is φ = 5350883328.

The previous prime is 22564638671. The next prime is 22564638721. The reversal of 22564638720 is 2783646522.

22564638720 is a `hidden beast` number, since 2 + 2 + 5 + 6 + 4 + 638 + 7 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (832).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22564638721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 309104604 + ... + 309104676.

Almost surely, 2^22564638720 is an apocalyptic number.

22564638720 is a gapful number since it is divisible by the number (20) 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 22564638720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44805425280).

22564638720 is an abundant number, since it is smaller than the sum of its proper divisors (67046211840).

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

22564638720 is a wasteful number, since it uses less digits than its factorization.

22564638720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The spelling of 22564638720 in words is "twenty-two billion, five hundred sixty-four million, six hundred thirty-eight thousand, seven hundred twenty".