28338889 has 2 divisors, whose sum is σ = 28338890. Its totient is φ = 28338888.

The previous prime is 28338859. The next prime is 28338901. The reversal of 28338889 is 98883382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28174864 + 164025 = 5308^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 28338889 - 2⁵ = 28338857 is a prime.

It is not a weakly prime, because it can be changed into another prime (28338839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14169444 + 14169445.

It is an arithmetic number, because the mean of its divisors is an integer number (14169445).

Almost surely, 2^28338889 is an apocalyptic number.

It is an amenable number.

28338889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28338889 is an equidigital number, since it uses as much as digits as its factorization.

28338889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 49.

The square root of 28338889 is about 5323.4283126572. The cubic root of 28338889 is about 304.8790669895.

The spelling of 28338889 in words is "twenty-eight million, three hundred thirty-eight thousand, eight hundred eighty-nine".