28173791 has 2 divisors, whose sum is σ = 28173792. Its totient is φ = 28173790.

The previous prime is 28173787. The next prime is 28173797. The reversal of 28173791 is 19737182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28173791 - 2² = 28173787 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28173797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14086895 + 14086896.

It is an arithmetic number, because the mean of its divisors is an integer number (14086896).

Almost surely, 2^28173791 is an apocalyptic number.

28173791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28173791 is an equidigital number, since it uses as much as digits as its factorization.

28173791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 28173791 is about 5307.8989251869. The cubic root of 28173791 is about 304.2858540182.

The spelling of 28173791 in words is "twenty-eight million, one hundred seventy-three thousand, seven hundred ninety-one".