28056185 has 8 divisors (see below), whose sum is σ = 33695880. Its totient is φ = 22425984.

The previous prime is 28056143. The next prime is 28056187. The reversal of 28056185 is 58165082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 724201 + 27331984 = 851^2 + 5228^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28056185 - 2²⁰ = 27007609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28056187) 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 7 ways as a sum of consecutive naturals, for example, 10109 + ... + 12581.

It is an arithmetic number, because the mean of its divisors is an integer number (4211985).

Almost surely, 2^28056185 is an apocalyptic number.

It is an amenable number.

28056185 is a deficient number, since it is larger than the sum of its proper divisors (5639695).

28056185 is a wasteful number, since it uses less digits than its factorization.

28056185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 28056185 is about 5296.8089450159. The cubic root of 28056185 is about 303.8618695235.

It can be divided in two parts, 280 and 56185, that added together give a palindrome (56465).

The spelling of 28056185 in words is "twenty-eight million, fifty-six thousand, one hundred eighty-five".