28904891 has 2 divisors, whose sum is σ = 28904892. Its totient is φ = 28904890.

The previous prime is 28904849. The next prime is 28904893. The reversal of 28904891 is 19840982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28904891 - 2¹⁴ = 28888507 is a prime.

Together with 28904893, 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 (28904893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14452445 + 14452446.

It is an arithmetic number, because the mean of its divisors is an integer number (14452446).

Almost surely, 2^28904891 is an apocalyptic number.

28904891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28904891 is an equidigital number, since it uses as much as digits as its factorization.

28904891 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28904891 is about 5376.3269059833. The cubic root of 28904891 is about 306.8954469309.

The spelling of 28904891 in words is "twenty-eight million, nine hundred four thousand, eight hundred ninety-one".