28347199 has 4 divisors (see below), whose sum is σ = 28827720. Its totient is φ = 27866680.

The previous prime is 28347197. The next prime is 28347229. The reversal of 28347199 is 99174382.

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 28347199 - 2¹ = 28347197 is a prime.

It is a super-2 number, since 2×28347199² = 1607127382291202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28347197) 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, 240172 + ... + 240289.

It is an arithmetic number, because the mean of its divisors is an integer number (7206930).

Almost surely, 2^28347199 is an apocalyptic number.

28347199 is a deficient number, since it is larger than the sum of its proper divisors (480521).

28347199 is an equidigital number, since it uses as much as digits as its factorization.

28347199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480520.

The product of its digits is 108864, while the sum is 43.

The square root of 28347199 is about 5324.2087675071. The cubic root of 28347199 is about 304.9088646460.

The spelling of 28347199 in words is "twenty-eight million, three hundred forty-seven thousand, one hundred ninety-nine".