28308785 has 16 divisors (see below), whose sum is σ = 35508240. Its totient is φ = 21638400.

The previous prime is 28308779. The next prime is 28308793. The reversal of 28308785 is 58780382.

It can be written as a sum of positive squares in 8 ways, for example, as 2917264 + 25391521 = 1708^2 + 5039^2 .

It is not a de Polignac number, because 28308785 - 2⁸ = 28308529 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13679 + ... + 15611.

It is an arithmetic number, because the mean of its divisors is an integer number (2219265).

Almost surely, 2^28308785 is an apocalyptic number.

It is an amenable number.

28308785 is a deficient number, since it is larger than the sum of its proper divisors (7199455).

28308785 is a wasteful number, since it uses less digits than its factorization.

28308785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 28308785 is about 5320.6000601436. The cubic root of 28308785 is about 304.7710725033.

The spelling of 28308785 in words is "twenty-eight million, three hundred eight thousand, seven hundred eighty-five".