28047197 has 2 divisors, whose sum is σ = 28047198. Its totient is φ = 28047196.

The previous prime is 28047179. The next prime is 28047199. The reversal of 28047197 is 79174082.

Together with previous prime (28047179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15007876 + 13039321 = 3874^2 + 3611^2 .

It is a cyclic number.

It is not a de Polignac number, because 28047197 - 2²² = 23852893 is a prime.

Together with 28047199, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28047197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28047199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14023598 + 14023599.

It is an arithmetic number, because the mean of its divisors is an integer number (14023599).

Almost surely, 2^28047197 is an apocalyptic number.

It is an amenable number.

28047197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28047197 is an equidigital number, since it uses as much as digits as its factorization.

28047197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 28047197 is about 5295.9604416952. The cubic root of 28047197 is about 303.8294179485.

It can be divided in two parts, 2804 and 7197, that added together give a palindrome (10001).

The spelling of 28047197 in words is "twenty-eight million, forty-seven thousand, one hundred ninety-seven".