28782791 has 2 divisors, whose sum is σ = 28782792. Its totient is φ = 28782790.

The previous prime is 28782773. The next prime is 28782797. The reversal of 28782791 is 19728782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28782791 - 2⁶ = 28782727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28782797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14391395 + 14391396.

It is an arithmetic number, because the mean of its divisors is an integer number (14391396).

Almost surely, 2^28782791 is an apocalyptic number.

28782791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28782791 is an equidigital number, since it uses as much as digits as its factorization.

28782791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 28782791 is about 5364.9595525036. The cubic root of 28782791 is about 306.4627079271.

The spelling of 28782791 in words is "twenty-eight million, seven hundred eighty-two thousand, seven hundred ninety-one".