28764091 has 2 divisors, whose sum is σ = 28764092. Its totient is φ = 28764090.

The previous prime is 28764067. The next prime is 28764139. The reversal of 28764091 is 19046782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28764091 - 2¹⁹ = 28239803 is a prime.

It is equal to p_1785961 and since 28764091 and 1785961 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28764091.

It is not a weakly prime, because it can be changed into another prime (28764011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14382045 + 14382046.

It is an arithmetic number, because the mean of its divisors is an integer number (14382046).

Almost surely, 2^28764091 is an apocalyptic number.

28764091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28764091 is an equidigital number, since it uses as much as digits as its factorization.

28764091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28764091 is about 5363.2164789425. The cubic root of 28764091 is about 306.3963245781.

The spelling of 28764091 in words is "twenty-eight million, seven hundred sixty-four thousand, ninety-one".