28180785 has 16 divisors (see below), whose sum is σ = 45190080. Its totient is φ = 14996160.

The previous prime is 28180783. The next prime is 28180787. The reversal of 28180785 is 58708182.

It is an interprime number because it is at equal distance from previous prime (28180783) and next prime (28180787).

It is not a de Polignac number, because 28180785 - 2¹ = 28180783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28180783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5790 + ... + 9480.

It is an arithmetic number, because the mean of its divisors is an integer number (2824380).

Almost surely, 2^28180785 is an apocalyptic number.

It is an amenable number.

28180785 is a deficient number, since it is larger than the sum of its proper divisors (17009295).

28180785 is a wasteful number, since it uses less digits than its factorization.

28180785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 28180785 is about 5308.5577137298. The cubic root of 28180785 is about 304.3110310723.

The spelling of 28180785 in words is "twenty-eight million, one hundred eighty thousand, seven hundred eighty-five".