28091677 has 2 divisors, whose sum is σ = 28091678. Its totient is φ = 28091676.

The previous prime is 28091663. The next prime is 28091711. The reversal of 28091677 is 77619082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26481316 + 1610361 = 5146^2 + 1269^2 .

It is a cyclic number.

It is not a de Polignac number, because 28091677 - 2¹⁵ = 28058909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28091627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14045838 + 14045839.

It is an arithmetic number, because the mean of its divisors is an integer number (14045839).

Almost surely, 2^28091677 is an apocalyptic number.

It is an amenable number.

28091677 is a deficient number, since it is larger than the sum of its proper divisors (1).

28091677 is an equidigital number, since it uses as much as digits as its factorization.

28091677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 28091677 is about 5300.1582051860. The cubic root of 28091677 is about 303.9899472957.

The spelling of 28091677 in words is "twenty-eight million, ninety-one thousand, six hundred seventy-seven".