28111816 has 8 divisors (see below), whose sum is σ = 52709670. Its totient is φ = 14055904.

The previous prime is 28111799. The next prime is 28111841. The reversal of 28111816 is 61811182.

It can be written as a sum of positive squares in only one way, i.e., 21068100 + 7043716 = 4590^2 + 2654^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1756981 + ... + 1756996.

Almost surely, 2^28111816 is an apocalyptic number.

It is an amenable number.

28111816 is a deficient number, since it is larger than the sum of its proper divisors (24597854).

28111816 is a wasteful number, since it uses less digits than its factorization.

28111816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513983 (or 3513979 counting only the distinct ones).

The product of its digits is 768, while the sum is 28.

The square root of 28111816 is about 5302.0577137560. The cubic root of 28111816 is about 304.0625736844.

Adding to 28111816 its reverse (61811182), we get a palindrome (89922998).

The spelling of 28111816 in words is "twenty-eight million, one hundred eleven thousand, eight hundred sixteen".