22737640 has 16 divisors (see below), whose sum is σ = 51159780. Its totient is φ = 9095040.

The previous prime is 22737629. The next prime is 22737643. The reversal of 22737640 is 4673722.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20958084 + 1779556 = 4578^2 + 1334^2 .

It is not an unprimeable number, because it can be changed into a prime (22737643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284181 + ... + 284260.

Almost surely, 2^22737640 is an apocalyptic number.

22737640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22737640 is an abundant number, since it is smaller than the sum of its proper divisors (28422140).

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

22737640 is a wasteful number, since it uses less digits than its factorization.

22737640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568452 (or 568448 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 22737640 is about 4768.4001509940. The cubic root of 22737640 is about 283.3012312726.

The spelling of 22737640 in words is "twenty-two million, seven hundred thirty-seven thousand, six hundred forty".