28197199 has 4 divisors (see below), whose sum is σ = 28583536. Its totient is φ = 27810864.

The previous prime is 28197187. The next prime is 28197209. The reversal of 28197199 is 99179182.

28197199 = T₃₉₄ + T₃₉₅ + ... + T₆₁₂.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99179182 = 2 ⋅49589591.

It is a cyclic number.

It is not a de Polignac number, because 28197199 - 2⁵ = 28197167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193059 + ... + 193204.

It is an arithmetic number, because the mean of its divisors is an integer number (7145884).

Almost surely, 2^28197199 is an apocalyptic number.

28197199 is a deficient number, since it is larger than the sum of its proper divisors (386337).

28197199 is an equidigital number, since it uses as much as digits as its factorization.

28197199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386336.

The product of its digits is 81648, while the sum is 46.

The square root of 28197199 is about 5310.1034829841. The cubic root of 28197199 is about 304.3701019581.

The spelling of 28197199 in words is "twenty-eight million, one hundred ninety-seven thousand, one hundred ninety-nine".