28236836 has 12 divisors (see below), whose sum is σ = 51118620. Its totient is φ = 13631520.

The previous prime is 28236833. The next prime is 28236851. The reversal of 28236836 is 63863282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20430400 + 7806436 = 4520^2 + 2794^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28236836.

It is not an unprimeable number, because it can be changed into a prime (28236833) 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 3 ways as a sum of consecutive naturals, for example, 121595 + ... + 121826.

It is an arithmetic number, because the mean of its divisors is an integer number (4259885).

Almost surely, 2^28236836 is an apocalyptic number.

It is an amenable number.

28236836 is a deficient number, since it is larger than the sum of its proper divisors (22881784).

28236836 is a wasteful number, since it uses less digits than its factorization.

28236836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243454 (or 243452 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 28236836 is about 5313.8343971185. The cubic root of 28236836 is about 304.5126535780.

The spelling of 28236836 in words is "twenty-eight million, two hundred thirty-six thousand, eight hundred thirty-six".