28778299 has 4 divisors (see below), whose sum is σ = 31394520. Its totient is φ = 26162080.

The previous prime is 28778273. The next prime is 28778329. The reversal of 28778299 is 99287782.

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

It is a cyclic number.

It is not a de Polignac number, because 28778299 - 2⁷ = 28778171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28778219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1308094 + ... + 1308115.

It is an arithmetic number, because the mean of its divisors is an integer number (7848630).

Almost surely, 2^28778299 is an apocalyptic number.

28778299 is a deficient number, since it is larger than the sum of its proper divisors (2616221).

28778299 is a wasteful number, since it uses less digits than its factorization.

28778299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616220.

The product of its digits is 1016064, while the sum is 52.

The square root of 28778299 is about 5364.5408936833. The cubic root of 28778299 is about 306.4467643482.

The spelling of 28778299 in words is "twenty-eight million, seven hundred seventy-eight thousand, two hundred ninety-nine".