22644972 has 72 divisors (see below), whose sum is σ = 68280576. Its totient is φ = 6187104.

The previous prime is 22644943. The next prime is 22645009. The reversal of 22644972 is 27944622.

22644972 is a `hidden beast` number, since 2 + 2 + 644 + 9 + 7 + 2 = 666.

It is a hoax number, since the sum of its digits (36) 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 (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3843 + ... + 7749.

Almost surely, 2^22644972 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 22644972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34140288).

22644972 is an abundant number, since it is smaller than the sum of its proper divisors (45635604).

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

22644972 is a wasteful number, since it uses less digits than its factorization.

22644972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947 (or 3942 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 22644972 is about 4758.6733445363. The cubic root of 22644972 is about 282.9158394083.

The spelling of 22644972 in words is "twenty-two million, six hundred forty-four thousand, nine hundred seventy-two".