28882989 has 6 divisors (see below), whose sum is σ = 41719886. Its totient is φ = 19255320.

The previous prime is 28882981. The next prime is 28882991. The reversal of 28882989 is 98928882.

It can be written as a sum of positive squares in only one way, i.e., 17288964 + 11594025 = 4158^2 + 3405^2 .

It is not a de Polignac number, because 28882989 - 2³ = 28882981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28882981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1604602 + ... + 1604619.

Almost surely, 2^28882989 is an apocalyptic number.

It is an amenable number.

28882989 is a deficient number, since it is larger than the sum of its proper divisors (12836897).

28882989 is a wasteful number, since it uses less digits than its factorization.

28882989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209227 (or 3209224 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 28882989 is about 5374.2896274764. The cubic root of 28882989 is about 306.8179130802.

The spelling of 28882989 in words is "twenty-eight million, eight hundred eighty-two thousand, nine hundred eighty-nine".