28998868 has 6 divisors (see below), whose sum is σ = 50748026. Its totient is φ = 14499432.

The previous prime is 28998847. The next prime is 28998911. The reversal of 28998868 is 86889982.

It can be written as a sum of positive squares in only one way, i.e., 24324624 + 4674244 = 4932^2 + 2162^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3624855 + ... + 3624862.

Almost surely, 2^28998868 is an apocalyptic number.

It is an amenable number.

28998868 is a deficient number, since it is larger than the sum of its proper divisors (21749158).

28998868 is a wasteful number, since it uses less digits than its factorization.

28998868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7249721 (or 7249719 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 58.

The square root of 28998868 is about 5385.0597025474. The cubic root of 28998868 is about 307.2276849733.

The spelling of 28998868 in words is "twenty-eight million, nine hundred ninety-eight thousand, eight hundred sixty-eight".