28871197 has 2 divisors, whose sum is σ = 28871198. Its totient is φ = 28871196.

The previous prime is 28871179. The next prime is 28871231. The reversal of 28871197 is 79117882.

It is a happy number.

Together with previous prime (28871179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26275876 + 2595321 = 5126^2 + 1611^2 .

It is a cyclic number.

It is not a de Polignac number, because 28871197 - 2⁷ = 28871069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28871497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435598 + 14435599.

It is an arithmetic number, because the mean of its divisors is an integer number (14435599).

Almost surely, 2^28871197 is an apocalyptic number.

It is an amenable number.

28871197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28871197 is an equidigital number, since it uses as much as digits as its factorization.

28871197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 43.

The square root of 28871197 is about 5373.1924402537. The cubic root of 28871197 is about 306.7761527518.

The spelling of 28871197 in words is "twenty-eight million, eight hundred seventy-one thousand, one hundred ninety-seven".