28894091 has 2 divisors, whose sum is σ = 28894092. Its totient is φ = 28894090.

The previous prime is 28894087. The next prime is 28894133. The reversal of 28894091 is 19049882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28894091 - 2² = 28894087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28894031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14447045 + 14447046.

It is an arithmetic number, because the mean of its divisors is an integer number (14447046).

Almost surely, 2^28894091 is an apocalyptic number.

28894091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28894091 is an equidigital number, since it uses as much as digits as its factorization.

28894091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 28894091 is about 5375.3224089351. The cubic root of 28894091 is about 306.8572194476.

The spelling of 28894091 in words is "twenty-eight million, eight hundred ninety-four thousand, ninety-one".