28667291 has 2 divisors, whose sum is σ = 28667292. Its totient is φ = 28667290.

The previous prime is 28667279. The next prime is 28667297. The reversal of 28667291 is 19276682.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28667291 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28667297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14333645 + 14333646.

It is an arithmetic number, because the mean of its divisors is an integer number (14333646).

Almost surely, 2^28667291 is an apocalyptic number.

28667291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28667291 is an equidigital number, since it uses as much as digits as its factorization.

28667291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 28667291 is about 5354.1844383622. The cubic root of 28667291 is about 306.0522323869.

The spelling of 28667291 in words is "twenty-eight million, six hundred sixty-seven thousand, two hundred ninety-one".