22685440 has 72 divisors (see below), whose sum is σ = 55923840. Its totient is φ = 8810496.

The previous prime is 22685389. The next prime is 22685479. The reversal of 22685440 is 4458622.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47121 + ... + 47599.

It is an arithmetic number, because the mean of its divisors is an integer number (776720).

Almost surely, 2^22685440 is an apocalyptic number.

22685440 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 22685440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27961920).

22685440 is an abundant number, since it is smaller than the sum of its proper divisors (33238400).

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

22685440 is an equidigital number, since it uses as much as digits as its factorization.

22685440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 22685440 is about 4762.9234719865. The cubic root of 22685440 is about 283.0842686282.

The spelling of 22685440 in words is "twenty-two million, six hundred eighty-five thousand, four hundred forty".