28578791 has 2 divisors, whose sum is σ = 28578792. Its totient is φ = 28578790.

The previous prime is 28578787. The next prime is 28578821. The reversal of 28578791 is 19787582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28578791 - 2² = 28578787 is a 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 (28578721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14289395 + 14289396.

It is an arithmetic number, because the mean of its divisors is an integer number (14289396).

Almost surely, 2^28578791 is an apocalyptic number.

28578791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28578791 is an equidigital number, since it uses as much as digits as its factorization.

28578791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 47.

The square root of 28578791 is about 5345.9134860190. The cubic root of 28578791 is about 305.7369654990.

The spelling of 28578791 in words is "twenty-eight million, five hundred seventy-eight thousand, seven hundred ninety-one".