22515640 has 64 divisors (see below), whose sum is σ = 58564800. Its totient is φ = 7630848.

The previous prime is 22515631. The next prime is 22515671. The reversal of 22515640 is 4651522.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26746 + ... + 27574.

It is an arithmetic number, because the mean of its divisors is an integer number (915075).

Almost surely, 2^22515640 is an apocalyptic number.

22515640 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 22515640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29282400).

22515640 is an abundant number, since it is smaller than the sum of its proper divisors (36049160).

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

22515640 is a wasteful number, since it uses less digits than its factorization.

22515640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 22515640 is about 4745.0648046154. The cubic root of 22515640 is about 282.3762059738.

The spelling of 22515640 in words is "twenty-two million, five hundred fifteen thousand, six hundred forty".