22125640 has 16 divisors (see below), whose sum is σ = 49782780. Its totient is φ = 8850240.

The previous prime is 22125629. The next prime is 22125647. The reversal of 22125640 is 4652122.

It can be written as a sum of positive squares in 2 ways, for example, as 18369796 + 3755844 = 4286^2 + 1938^2 .

It is not an unprimeable number, because it can be changed into a prime (22125647) 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, 276531 + ... + 276610.

Almost surely, 2^22125640 is an apocalyptic number.

22125640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22125640 is an abundant number, since it is smaller than the sum of its proper divisors (27657140).

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

22125640 is a wasteful number, since it uses less digits than its factorization.

22125640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553152 (or 553148 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 22125640 is about 4703.7899612972. The cubic root of 22125640 is about 280.7363272594.

Adding to 22125640 its reverse (4652122), we get a palindrome (26777762).

The spelling of 22125640 in words is "twenty-two million, one hundred twenty-five thousand, six hundred forty".