28444868 has 12 divisors (see below), whose sum is σ = 49889280. Its totient is φ = 14190792.

The previous prime is 28444837. The next prime is 28444877. The reversal of 28444868 is 86844482.

It is a happy number.

It is a super-2 number, since 2×28444868² = 1618221031074848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5828 + ... + 9531.

It is an arithmetic number, because the mean of its divisors is an integer number (4157440).

Almost surely, 2^28444868 is an apocalyptic number.

It is an amenable number.

28444868 is a deficient number, since it is larger than the sum of its proper divisors (21444412).

28444868 is a wasteful number, since it uses less digits than its factorization.

28444868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15826 (or 15824 counting only the distinct ones).

The product of its digits is 393216, while the sum is 44.

The square root of 28444868 is about 5333.3730415188. The cubic root of 28444868 is about 305.2586464965.

The spelling of 28444868 in words is "twenty-eight million, four hundred forty-four thousand, eight hundred sixty-eight".