28366091 has 4 divisors (see below), whose sum is σ = 30548112. Its totient is φ = 26184072.

The previous prime is 28366073. The next prime is 28366099. The reversal of 28366091 is 19066382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28366091 - 2¹⁴ = 28349707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28366099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090991 + ... + 1091016.

It is an arithmetic number, because the mean of its divisors is an integer number (7637028).

Almost surely, 2^28366091 is an apocalyptic number.

28366091 is a deficient number, since it is larger than the sum of its proper divisors (2182021).

28366091 is a wasteful number, since it uses less digits than its factorization.

28366091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182020.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28366091 is about 5325.9826323412. The cubic root of 28366091 is about 304.9765851415.

The spelling of 28366091 in words is "twenty-eight million, three hundred sixty-six thousand, ninety-one".