22991640056 has 96 divisors (see below), whose sum is σ = 54753926400. Its totient is φ = 8950011840.

The previous prime is 22991640011. The next prime is 22991640059. The reversal of 22991640056 is 65004619922.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 22991639989 and 22991640016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22991640059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9394625 + ... + 9397071.

It is an arithmetic number, because the mean of its divisors is an integer number (570353400).

Almost surely, 2^22991640056 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 22991640056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27376963200).

22991640056 is an abundant number, since it is smaller than the sum of its proper divisors (31762286344).

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

22991640056 is a wasteful number, since it uses less digits than its factorization.

22991640056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4657 (or 4646 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 22991640056 in words is "twenty-two billion, nine hundred ninety-one million, six hundred forty thousand, fifty-six".