28741891 has 2 divisors, whose sum is σ = 28741892. Its totient is φ = 28741890.

The previous prime is 28741879. The next prime is 28741913. The reversal of 28741891 is 19814782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28741891 - 2⁹ = 28741379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28741831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14370945 + 14370946.

It is an arithmetic number, because the mean of its divisors is an integer number (14370946).

Almost surely, 2^28741891 is an apocalyptic number.

28741891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28741891 is an equidigital number, since it uses as much as digits as its factorization.

28741891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 28741891 is about 5361.1464259056. The cubic root of 28741891 is about 306.3174791747.

The spelling of 28741891 in words is "twenty-eight million, seven hundred forty-one thousand, eight hundred ninety-one".