28339691 has 4 divisors (see below), whose sum is σ = 28620384. Its totient is φ = 28059000.

The previous prime is 28339687. The next prime is 28339711. The reversal of 28339691 is 19693382.

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 28339691 - 2² = 28339687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28339601) 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, 140195 + ... + 140396.

It is an arithmetic number, because the mean of its divisors is an integer number (7155096).

Almost surely, 2^28339691 is an apocalyptic number.

28339691 is a deficient number, since it is larger than the sum of its proper divisors (280693).

28339691 is a wasteful number, since it uses less digits than its factorization.

28339691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280692.

The product of its digits is 69984, while the sum is 41.

The square root of 28339691 is about 5323.5036395216. The cubic root of 28339691 is about 304.8819430221.

The spelling of 28339691 in words is "twenty-eight million, three hundred thirty-nine thousand, six hundred ninety-one".