22290640 has 40 divisors (see below), whose sum is σ = 52496640. Its totient is φ = 8800896.

The previous prime is 22290617. The next prime is 22290661. The reversal of 22290640 is 4609222.

It is a tau number, because it is divible by the number of its divisors (40).

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, 4557 + ... + 8083.

It is an arithmetic number, because the mean of its divisors is an integer number (1312416).

Almost surely, 2^22290640 is an apocalyptic number.

22290640 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 22290640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26248320).

22290640 is an abundant number, since it is smaller than the sum of its proper divisors (30206000).

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

22290640 is a wasteful number, since it uses less digits than its factorization.

22290640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3619 (or 3613 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 22290640 is about 4721.2964321254. The cubic root of 22290640 is about 281.4324551084.

Adding to 22290640 its reverse (4609222), we get a palindrome (26899862).

The spelling of 22290640 in words is "twenty-two million, two hundred ninety thousand, six hundred forty".