22704640 has 120 divisors (see below), whose sum is σ = 63675612. Its totient is φ = 7741440.

The previous prime is 22704637. The next prime is 22704691. The reversal of 22704640 is 4640722.

It can be written as a sum of positive squares in 2 ways, for example, as 19079424 + 3625216 = 4368^2 + 1904^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125350 + ... + 125530.

Almost surely, 2^22704640 is an apocalyptic number.

22704640 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 22704640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31837806).

22704640 is an abundant number, since it is smaller than the sum of its proper divisors (40970972).

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

22704640 is an equidigital number, since it uses as much as digits as its factorization.

22704640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 22704640 is about 4764.9386145049. The cubic root of 22704640 is about 283.1641096378.

The spelling of 22704640 in words is "twenty-two million, seven hundred four thousand, six hundred forty".