22643281008 has 240 divisors, whose sum is σ = 68225772160. Its totient is φ = 6989068800.

The previous prime is 22643280973. The next prime is 22643281009. The reversal of 22643281008 is 80018234622.

22643281008 is a `hidden beast` number, since 2 + 2 + 643 + 2 + 8 + 1 + 0 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22643281009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35214735 + ... + 35215377.

Almost surely, 2^22643281008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22643281008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34112886080).

22643281008 is an abundant number, since it is smaller than the sum of its proper divisors (45582491152).

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

22643281008 is a wasteful number, since it uses less digits than its factorization.

22643281008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 22643281008 in words is "twenty-two billion, six hundred forty-three million, two hundred eighty-one thousand, eight".