28964891 has 2 divisors, whose sum is σ = 28964892. Its totient is φ = 28964890.

The previous prime is 28964857. The next prime is 28964893. The reversal of 28964891 is 19846982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28964891 - 2²² = 24770587 is a prime.

It is a Sophie Germain prime.

Together with 28964893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28964893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14482445 + 14482446.

It is an arithmetic number, because the mean of its divisors is an integer number (14482446).

Almost surely, 2^28964891 is an apocalyptic number.

28964891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28964891 is an equidigital number, since it uses as much as digits as its factorization.

28964891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 28964891 is about 5381.9040311027. The cubic root of 28964891 is about 307.1076486258.

The spelling of 28964891 in words is "twenty-eight million, nine hundred sixty-four thousand, eight hundred ninety-one".