28818868 has 12 divisors (see below), whose sum is σ = 54312580. Its totient is φ = 13300992.

The previous prime is 28818863. The next prime is 28818883. The reversal of 28818868 is 86881882.

It can be written as a sum of positive squares in 2 ways, for example, as 8225424 + 20593444 = 2868^2 + 4538^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28818863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277053 + ... + 277156.

Almost surely, 2^28818868 is an apocalyptic number.

It is an amenable number.

28818868 is a deficient number, since it is larger than the sum of its proper divisors (25493712).

28818868 is a wasteful number, since it uses less digits than its factorization.

28818868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554226 (or 554224 counting only the distinct ones).

The product of its digits is 393216, while the sum is 49.

The square root of 28818868 is about 5368.3207802813. The cubic root of 28818868 is about 306.5906968927.

The spelling of 28818868 in words is "twenty-eight million, eight hundred eighteen thousand, eight hundred sixty-eight".