28268297 has 4 divisors (see below), whose sum is σ = 29931156. Its totient is φ = 26605440.

The previous prime is 28268293. The next prime is 28268309. The reversal of 28268297 is 79286282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17172736 + 11095561 = 4144^2 + 3331^2 .

It is a cyclic number.

It is not a de Polignac number, because 28268297 - 2² = 28268293 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28268293) 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, 831404 + ... + 831437.

It is an arithmetic number, because the mean of its divisors is an integer number (7482789).

Almost surely, 2^28268297 is an apocalyptic number.

It is an amenable number.

28268297 is a deficient number, since it is larger than the sum of its proper divisors (1662859).

28268297 is a wasteful number, since it uses less digits than its factorization.

28268297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662858.

The product of its digits is 193536, while the sum is 44.

The square root of 28268297 is about 5316.7938647271. The cubic root of 28268297 is about 304.6257058658.

The spelling of 28268297 in words is "twenty-eight million, two hundred sixty-eight thousand, two hundred ninety-seven".