28135785 has 16 divisors (see below), whose sum is σ = 46975104. Its totient is φ = 14353152.

The previous prime is 28135781. The next prime is 28135847. The reversal of 28135785 is 58753182.

It is not a de Polignac number, because 28135785 - 2² = 28135781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28135781) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 40432 + ... + 41121.

It is an arithmetic number, because the mean of its divisors is an integer number (2935944).

Almost surely, 2^28135785 is an apocalyptic number.

It is an amenable number.

28135785 is a deficient number, since it is larger than the sum of its proper divisors (18839319).

28135785 is a wasteful number, since it uses less digits than its factorization.

28135785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81584.

The product of its digits is 67200, while the sum is 39.

The square root of 28135785 is about 5304.3175809900. The cubic root of 28135785 is about 304.1489668398.

It can be divided in two parts, 28135 and 785, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 28135785 in words is "twenty-eight million, one hundred thirty-five thousand, seven hundred eighty-five".