28785015 has 24 divisors (see below), whose sum is σ = 57022368. Its totient is φ = 13158720.

The previous prime is 28785013. The next prime is 28785073. The reversal of 28785015 is 51058782.

It is not a de Polignac number, because 28785015 - 2¹ = 28785013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45376 + ... + 46005.

It is an arithmetic number, because the mean of its divisors is an integer number (2375932).

Almost surely, 2^28785015 is an apocalyptic number.

28785015 is a deficient number, since it is larger than the sum of its proper divisors (28237353).

28785015 is a wasteful number, since it uses less digits than its factorization.

28785015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91399 (or 91396 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 28785015 is about 5365.1668194009. The cubic root of 28785015 is about 306.4706010175.

The spelling of 28785015 in words is "twenty-eight million, seven hundred eighty-five thousand, fifteen".