28757768 has 16 divisors (see below), whose sum is σ = 58068780. Its totient is φ = 13272768.

The previous prime is 28757741. The next prime is 28757777. The reversal of 28757768 is 86775782.

It can be written as a sum of positive squares in 2 ways, for example, as 28751044 + 6724 = 5362^2 + 82^2 .

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, 138155 + ... + 138362.

Almost surely, 2^28757768 is an apocalyptic number.

It is an amenable number.

28757768 is an abundant number, since it is smaller than the sum of its proper divisors (29311012).

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

28757768 is a wasteful number, since it uses less digits than its factorization.

28757768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276536 (or 276532 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 50.

The square root of 28757768 is about 5362.6269681939. The cubic root of 28757768 is about 306.3738719775.

The spelling of 28757768 in words is "twenty-eight million, seven hundred fifty-seven thousand, seven hundred sixty-eight".