28878299 has 4 divisors (see below), whose sum is σ = 28911960. Its totient is φ = 28844640.

The previous prime is 28878281. The next prime is 28878301. The reversal of 28878299 is 99287882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28878299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28878299.

It is not an unprimeable number, because it can be changed into a prime (28878209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15509 + ... + 17270.

It is an arithmetic number, because the mean of its divisors is an integer number (7227990).

Almost surely, 2^28878299 is an apocalyptic number.

28878299 is a deficient number, since it is larger than the sum of its proper divisors (33661).

28878299 is an equidigital number, since it uses as much as digits as its factorization.

28878299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33660.

The product of its digits is 1161216, while the sum is 53.

The square root of 28878299 is about 5373.8532730249. The cubic root of 28878299 is about 306.8013052203.

It can be divided in two parts, 288 and 78299, that added together give a palindrome (78587).

The spelling of 28878299 in words is "twenty-eight million, eight hundred seventy-eight thousand, two hundred ninety-nine".