28408299 has 4 divisors (see below), whose sum is σ = 37877736. Its totient is φ = 18938864.

The previous prime is 28408297. The next prime is 28408301. The reversal of 28408299 is 99280482.

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

It is an interprime number because it is at equal distance from previous prime (28408297) and next prime (28408301).

It is a cyclic number.

It is not a de Polignac number, because 28408299 - 2¹ = 28408297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28408299.

It is not an unprimeable number, because it can be changed into a prime (28408297) 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, 4734714 + ... + 4734719.

It is an arithmetic number, because the mean of its divisors is an integer number (9469434).

Almost surely, 2^28408299 is an apocalyptic number.

28408299 is a deficient number, since it is larger than the sum of its proper divisors (9469437).

28408299 is an equidigital number, since it uses as much as digits as its factorization.

28408299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9469436.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 28408299 is about 5329.9436207150. The cubic root of 28408299 is about 305.1277758990.

The spelling of 28408299 in words is "twenty-eight million, four hundred eight thousand, two hundred ninety-nine".