22533640 has 32 divisors (see below), whose sum is σ = 51401880. Its totient is φ = 8888832.

The previous prime is 22533631. The next prime is 22533649. The reversal of 22533640 is 4633522.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22533631) and next prime (22533649).

It can be written as a sum of positive squares in 4 ways, for example, as 18541636 + 3992004 = 4306^2 + 1998^2 .

It is not an unprimeable number, because it can be changed into a prime (22533649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 939 + ... + 6778.

Almost surely, 2^22533640 is an apocalyptic number.

22533640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22533640 is an abundant number, since it is smaller than the sum of its proper divisors (28868240).

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

22533640 is a wasteful number, since it uses less digits than its factorization.

22533640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7801 (or 7797 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 22533640 is about 4746.9611331883. The cubic root of 22533640 is about 282.4514339464.

The spelling of 22533640 in words is "twenty-two million, five hundred thirty-three thousand, six hundred forty".