22528540 has 24 divisors (see below), whose sum is σ = 47410272. Its totient is φ = 8992320.

The previous prime is 22528511. The next prime is 22528543. The reversal of 22528540 is 4582522.

It is a super-2 number, since 2×22528540² = 1015070229063200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22528499 and 22528508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22528543) 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, 12070 + ... + 13810.

It is an arithmetic number, because the mean of its divisors is an integer number (1975428).

Almost surely, 2^22528540 is an apocalyptic number.

22528540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22528540 is an abundant number, since it is smaller than the sum of its proper divisors (24881732).

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

22528540 is a wasteful number, since it uses less digits than its factorization.

22528540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397 (or 2395 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 22528540 is about 4746.4239170137. The cubic root of 22528540 is about 282.4301234228.

The spelling of 22528540 in words is "twenty-two million, five hundred twenty-eight thousand, five hundred forty".