28705299 has 16 divisors (see below), whose sum is σ = 46315008. Its totient is φ = 15437952.

The previous prime is 28705267. The next prime is 28705321. The reversal of 28705299 is 99250782.

It is not a de Polignac number, because 28705299 - 2⁵ = 28705267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28705299.

It is not an unprimeable number, because it can be changed into a prime (28705399) 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, 39847 + ... + 40560.

It is an arithmetic number, because the mean of its divisors is an integer number (2894688).

Almost surely, 2^28705299 is an apocalyptic number.

28705299 is a deficient number, since it is larger than the sum of its proper divisors (17609709).

28705299 is a wasteful number, since it uses less digits than its factorization.

28705299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80434.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 28705299 is about 5357.7326361064. The cubic root of 28705299 is about 306.1874305605.

The spelling of 28705299 in words is "twenty-eight million, seven hundred five thousand, two hundred ninety-nine".