22992640 has 144 divisors (see below), whose sum is σ = 63576576. Its totient is φ = 7884800.

The previous prime is 22992631. The next prime is 22992647. The reversal of 22992640 is 4629922.

It is a happy number.

It is a super-2 number, since 2×22992640² = 1057322988339200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22992596 and 22992605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22992647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323805 + ... + 323875.

It is an arithmetic number, because the mean of its divisors is an integer number (441504).

Almost surely, 2^22992640 is an apocalyptic number.

22992640 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 22992640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31788288).

22992640 is an abundant number, since it is smaller than the sum of its proper divisors (40583936).

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

22992640 is a wasteful number, since it uses less digits than its factorization.

22992640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 22992640 is about 4795.0641288725. The cubic root of 22992640 is about 284.3563601678.

It can be divided in two parts, 22992 and 640, that added together give a palindrome (23632).

The spelling of 22992640 in words is "twenty-two million, nine hundred ninety-two thousand, six hundred forty".