28522993 has 2 divisors, whose sum is σ = 28522994. Its totient is φ = 28522992.

The previous prime is 28522981. The next prime is 28523081. The reversal of 28522993 is 39922582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21086464 + 7436529 = 4592^2 + 2727^2 .

It is a cyclic number.

It is not a de Polignac number, because 28522993 - 2⁵ = 28522961 is a prime.

It is a super-2 number, since 2×28522993² = 1627122259356098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28522903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14261496 + 14261497.

It is an arithmetic number, because the mean of its divisors is an integer number (14261497).

Almost surely, 2^28522993 is an apocalyptic number.

It is an amenable number.

28522993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28522993 is an equidigital number, since it uses as much as digits as its factorization.

28522993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 28522993 is about 5340.6921836032. The cubic root of 28522993 is about 305.5378595053.

The spelling of 28522993 in words is "twenty-eight million, five hundred twenty-two thousand, nine hundred ninety-three".