28109868 has 24 divisors (see below), whose sum is σ = 65683968. Its totient is φ = 9356496.

The previous prime is 28109867. The next prime is 28109869. The reversal of 28109868 is 86890182.

It is an interprime number because it is at equal distance from previous prime (28109867) and next prime (28109869).

It is not an unprimeable number, because it can be changed into a prime (28109867) 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 7 ways as a sum of consecutive naturals, for example, 10605 + ... + 12987.

It is an arithmetic number, because the mean of its divisors is an integer number (2736832).

Almost surely, 2^28109868 is an apocalyptic number.

It is an amenable number.

28109868 is an abundant number, since it is smaller than the sum of its proper divisors (37574100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28109868 is a wasteful number, since it uses less digits than its factorization.

28109868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373 (or 3371 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28109868 is about 5301.8740083106. The cubic root of 28109868 is about 304.0555502134.

The spelling of 28109868 in words is "twenty-eight million, one hundred nine thousand, eight hundred sixty-eight".