28269491 has 2 divisors, whose sum is σ = 28269492. Its totient is φ = 28269490.

The previous prime is 28269401. The next prime is 28269499. The reversal of 28269491 is 19496282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28269491 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28269499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14134745 + 14134746.

It is an arithmetic number, because the mean of its divisors is an integer number (14134746).

Almost surely, 2^28269491 is an apocalyptic number.

28269491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28269491 is an equidigital number, since it uses as much as digits as its factorization.

28269491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 28269491 is about 5316.9061492564. The cubic root of 28269491 is about 304.6299947455.

The spelling of 28269491 in words is "twenty-eight million, two hundred sixty-nine thousand, four hundred ninety-one".