28285197 has 4 divisors (see below), whose sum is σ = 37713600. Its totient is φ = 18856796.

The previous prime is 28285181. The next prime is 28285217. The reversal of 28285197 is 79158282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28285197 - 2⁴ = 28285181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28285177) 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, 4714197 + ... + 4714202.

It is an arithmetic number, because the mean of its divisors is an integer number (9428400).

Almost surely, 2^28285197 is an apocalyptic number.

It is an amenable number.

28285197 is a deficient number, since it is larger than the sum of its proper divisors (9428403).

28285197 is an equidigital number, since it uses as much as digits as its factorization.

28285197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9428402.

The product of its digits is 80640, while the sum is 42.

The square root of 28285197 is about 5318.3829309293. The cubic root of 28285197 is about 304.6863998751.

It can be divided in two parts, 28285 and 197, that added together give a palindrome (28482).

The spelling of 28285197 in words is "twenty-eight million, two hundred eighty-five thousand, one hundred ninety-seven".