28398868 has 12 divisors (see below), whose sum is σ = 49884660. Its totient is φ = 14146112.

The previous prime is 28398847. The next prime is 28398889. The reversal of 28398868 is 86889382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28398847) and next prime (28398889).

It can be written as a sum of positive squares in 2 ways, for example, as 6290064 + 22108804 = 2508^2 + 4702^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12121 + ... + 14272.

It is an arithmetic number, because the mean of its divisors is an integer number (4157055).

Almost surely, 2^28398868 is an apocalyptic number.

It is an amenable number.

28398868 is a deficient number, since it is larger than the sum of its proper divisors (21485792).

28398868 is a wasteful number, since it uses less digits than its factorization.

28398868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26666 (or 26664 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 52.

The square root of 28398868 is about 5329.0588287239. The cubic root of 28398868 is about 305.0940066759.

The spelling of 28398868 in words is "twenty-eight million, three hundred ninety-eight thousand, eight hundred sixty-eight".