28188436 has 12 divisors (see below), whose sum is σ = 49884660. Its totient is φ = 13935680.

The previous prime is 28188427. The next prime is 28188463. The reversal of 28188436 is 63488182.

It can be written as a sum of positive squares in 2 ways, for example, as 9265936 + 18922500 = 3044^2 + 4350^2 .

It is a congruent number.

It is an unprimeable number.

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, 39235 + ... + 39946.

It is an arithmetic number, because the mean of its divisors is an integer number (4157055).

Almost surely, 2^28188436 is an apocalyptic number.

It is an amenable number.

28188436 is a deficient number, since it is larger than the sum of its proper divisors (21696224).

28188436 is a wasteful number, since it uses less digits than its factorization.

28188436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79274 (or 79272 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 28188436 is about 5309.2782937043. The cubic root of 28188436 is about 304.3385684294.

The spelling of 28188436 in words is "twenty-eight million, one hundred eighty-eight thousand, four hundred thirty-six".