28775636 has 12 divisors (see below), whose sum is σ = 50405460. Its totient is φ = 14374080.

The previous prime is 28775597. The next prime is 28775653. The reversal of 28775636 is 63657782.

It can be written as a sum of positive squares in 2 ways, for example, as 16483600 + 12292036 = 4060^2 + 3506^2 .

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, 2366 + ... + 7946.

It is an arithmetic number, because the mean of its divisors is an integer number (4200455).

Almost surely, 2^28775636 is an apocalyptic number.

It is an amenable number.

28775636 is a deficient number, since it is larger than the sum of its proper divisors (21629824).

28775636 is a wasteful number, since it uses less digits than its factorization.

28775636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6874 (or 6872 counting only the distinct ones).

The product of its digits is 423360, while the sum is 44.

The square root of 28775636 is about 5364.2926840358. The cubic root of 28775636 is about 306.4373117058.

The spelling of 28775636 in words is "twenty-eight million, seven hundred seventy-five thousand, six hundred thirty-six".