28816889 has 2 divisors, whose sum is σ = 28816890. Its totient is φ = 28816888.

The previous prime is 28816883. The next prime is 28816897. The reversal of 28816889 is 98861882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 1776889 = 5200^2 + 1333^2 .

It is a cyclic number.

It is not a de Polignac number, because 28816889 - 2¹² = 28812793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28816883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14408444 + 14408445.

It is an arithmetic number, because the mean of its divisors is an integer number (14408445).

Almost surely, 2^28816889 is an apocalyptic number.

It is an amenable number.

28816889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28816889 is an equidigital number, since it uses as much as digits as its factorization.

28816889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 50.

The square root of 28816889 is about 5368.1364550466. The cubic root of 28816889 is about 306.5836788415.

The spelling of 28816889 in words is "twenty-eight million, eight hundred sixteen thousand, eight hundred eighty-nine".