28195 has 4 divisors (see below), whose sum is σ = 33840. Its totient is φ = 22552.

The previous prime is 28183. The next prime is 28201. The reversal of 28195 is 59182.

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 28195 - 2⁵ = 28163 is a prime.

28195 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2815 + ... + 2824.

It is an arithmetic number, because the mean of its divisors is an integer number (8460).

2²⁸¹⁹⁵ is an apocalyptic number.

28195 is a deficient number, since it is larger than the sum of its proper divisors (5645).

28195 is an equidigital number, since it uses as much as digits as its factorization.

28195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5644.

The product of its digits is 720, while the sum is 25.

The square root of 28195 is about 167.9136682942. The cubic root of 28195 is about 30.4362189503.

It can be divided in two parts, 28 and 195, that multiplied together give a triangular number (5460 = T₁₀₄).

The spelling of 28195 in words is "twenty-eight thousand, one hundred ninety-five".