28685757 has 16 divisors (see below), whose sum is σ = 39739392. Its totient is φ = 18386160.

The previous prime is 28685747. The next prime is 28685771. The reversal of 28685757 is 75758682.

It is not a de Polignac number, because 28685757 - 2¹⁵ = 28652989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28685747) 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 15 ways as a sum of consecutive naturals, for example, 14608 + ... + 16454.

It is an arithmetic number, because the mean of its divisors is an integer number (2483712).

Almost surely, 2^28685757 is an apocalyptic number.

It is an amenable number.

28685757 is a deficient number, since it is larger than the sum of its proper divisors (11053635).

28685757 is a wasteful number, since it uses less digits than its factorization.

28685757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048.

The product of its digits is 940800, while the sum is 48.

The square root of 28685757 is about 5355.9086063898. The cubic root of 28685757 is about 306.1179326709.

The spelling of 28685757 in words is "twenty-eight million, six hundred eighty-five thousand, seven hundred fifty-seven".