22549640 has 32 divisors (see below), whose sum is σ = 50912280. Its totient is φ = 8988672.

The previous prime is 22549621. The next prime is 22549661. The reversal of 22549640 is 4694522.

It can be written as a sum of positive squares in 4 ways, for example, as 13823524 + 8726116 = 3718^2 + 2954^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22549597 and 22549606.

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, 13322 + ... + 14918.

Almost surely, 2^22549640 is an apocalyptic number.

22549640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22549640 is an abundant number, since it is smaller than the sum of its proper divisors (28362640).

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

22549640 is a wasteful number, since it uses less digits than its factorization.

22549640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 22549640 is about 4748.6461228439. The cubic root of 22549640 is about 282.5182696306.

The spelling of 22549640 in words is "twenty-two million, five hundred forty-nine thousand, six hundred forty".