28868305 has 16 divisors (see below), whose sum is σ = 36170064. Its totient is φ = 22097920.

The previous prime is 28868299. The next prime is 28868321. The reversal of 28868305 is 50386882.

It can be written as a sum of positive squares in 8 ways, for example, as 746496 + 28121809 = 864^2 + 5303^2 .

It is not a de Polignac number, because 28868305 - 2⁹ = 28867793 is a prime.

It is a Duffinian 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, 9537 + ... + 12193.

It is an arithmetic number, because the mean of its divisors is an integer number (2260629).

Almost surely, 2^28868305 is an apocalyptic number.

It is an amenable number.

28868305 is a deficient number, since it is larger than the sum of its proper divisors (7301759).

28868305 is a wasteful number, since it uses less digits than its factorization.

28868305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28868305 is about 5372.9233197581. The cubic root of 28868305 is about 306.7659092525.

The spelling of 28868305 in words is "twenty-eight million, eight hundred sixty-eight thousand, three hundred five".