28942889 has 4 divisors (see below), whose sum is σ = 29268180. Its totient is φ = 28617600.

The previous prime is 28942883. The next prime is 28942931. The reversal of 28942889 is 98824982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9406489 + 19536400 = 3067^2 + 4420^2 .

It is a cyclic number.

It is not a de Polignac number, because 28942889 - 2⁴ = 28942873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28942883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162512 + ... + 162689.

It is an arithmetic number, because the mean of its divisors is an integer number (7317045).

Almost surely, 2^28942889 is an apocalyptic number.

It is an amenable number.

28942889 is a deficient number, since it is larger than the sum of its proper divisors (325291).

28942889 is an equidigital number, since it uses as much as digits as its factorization.

28942889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325290.

The product of its digits is 663552, while the sum is 50.

The square root of 28942889 is about 5379.8595706580. The cubic root of 28942889 is about 307.0298683216.

The spelling of 28942889 in words is "twenty-eight million, nine hundred forty-two thousand, eight hundred eighty-nine".