28108818 has 12 divisors (see below), whose sum is σ = 60902478. Its totient is φ = 9369600.

The previous prime is 28108807. The next prime is 28108819. The reversal of 28108818 is 81880182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14953689 + 13155129 = 3867^2 + 3627^2 .

It is not an unprimeable number, because it can be changed into a prime (28108819) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 780783 + ... + 780818.

Almost surely, 2^28108818 is an apocalyptic number.

28108818 is an abundant number, since it is smaller than the sum of its proper divisors (32793660).

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

28108818 is a wasteful number, since it uses less digits than its factorization.

28108818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561609 (or 1561606 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 28108818 is about 5301.7749857949. The cubic root of 28108818 is about 304.0517643269.

It can be divided in two parts, 2810 and 8818, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 28108818 in words is "twenty-eight million, one hundred eight thousand, eight hundred eighteen".