28572889 has 2 divisors, whose sum is σ = 28572890. Its totient is φ = 28572888.

The previous prime is 28572871. The next prime is 28572893. The reversal of 28572889 is 98827582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15468489 + 13104400 = 3933^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 28572889 - 2¹⁵ = 28540121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28572809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14286444 + 14286445.

It is an arithmetic number, because the mean of its divisors is an integer number (14286445).

Almost surely, 2^28572889 is an apocalyptic number.

It is an amenable number.

28572889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28572889 is an equidigital number, since it uses as much as digits as its factorization.

28572889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 49.

The square root of 28572889 is about 5345.3614470866. The cubic root of 28572889 is about 305.7159174451.

The spelling of 28572889 in words is "twenty-eight million, five hundred seventy-two thousand, eight hundred eighty-nine".