28231197 has 4 divisors (see below), whose sum is σ = 37641600. Its totient is φ = 18820796.

The previous prime is 28231163. The next prime is 28231213. The reversal of 28231197 is 79113282.

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 28231197 - 2¹⁰ = 28230173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28231117) 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, 4705197 + ... + 4705202.

It is an arithmetic number, because the mean of its divisors is an integer number (9410400).

Almost surely, 2^28231197 is an apocalyptic number.

It is an amenable number.

28231197 is a deficient number, since it is larger than the sum of its proper divisors (9410403).

28231197 is an equidigital number, since it uses as much as digits as its factorization.

28231197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410402.

The product of its digits is 6048, while the sum is 33.

The square root of 28231197 is about 5313.3037744891. The cubic root of 28231197 is about 304.4923814628.

The spelling of 28231197 in words is "twenty-eight million, two hundred thirty-one thousand, one hundred ninety-seven".