22640656878 has 120 divisors (see below), whose sum is σ = 59717902608. Its totient is φ = 6187237056.

The previous prime is 22640656811. The next prime is 22640656889. The reversal of 22640656878 is 87865604622.

22640656878 is a `hidden beast` number, since 2 + 2 + 6 + 4 + 0 + 6 + 568 + 78 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 982626 + ... + 1005402.

Almost surely, 2^22640656878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22640656878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29858951304).

22640656878 is an abundant number, since it is smaller than the sum of its proper divisors (37077245730).

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

22640656878 is a wasteful number, since it uses less digits than its factorization.

22640656878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22836 (or 22812 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 22640656878 in words is "twenty-two billion, six hundred forty million, six hundred fifty-six thousand, eight hundred seventy-eight".