22728529 has 2 divisors, whose sum is σ = 22728530. Its totient is φ = 22728528.

The previous prime is 22728521. The next prime is 22728569. The reversal of 22728529 is 92582722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15000129 + 7728400 = 3873^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 22728529 - 2³ = 22728521 is a prime.

It is not a weakly prime, because it can be changed into another prime (22728521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11364264 + 11364265.

It is an arithmetic number, because the mean of its divisors is an integer number (11364265).

Almost surely, 2^22728529 is an apocalyptic number.

It is an amenable number.

22728529 is a deficient number, since it is larger than the sum of its proper divisors (1).

22728529 is an equidigital number, since it uses as much as digits as its factorization.

22728529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 22728529 is about 4767.4447034024. Note that the first 3 decimals coincide. The cubic root of 22728529 is about 283.2633865013.

It can be divided in two parts, 2272 and 8529, that added together give a palindrome (10801).

The spelling of 22728529 in words is "twenty-two million, seven hundred twenty-eight thousand, five hundred twenty-nine".