28335689 has 4 divisors (see below), whose sum is σ = 28938624. Its totient is φ = 27732756.

The previous prime is 28335683. The next prime is 28335709. The reversal of 28335689 is 98653382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28335689 - 2¹² = 28331593 is a prime.

It is a super-2 number, since 2×28335689² = 1605822542209442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28335683) 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, 301397 + ... + 301490.

It is an arithmetic number, because the mean of its divisors is an integer number (7234656).

Almost surely, 2^28335689 is an apocalyptic number.

It is an amenable number.

28335689 is a deficient number, since it is larger than the sum of its proper divisors (602935).

28335689 is an equidigital number, since it uses as much as digits as its factorization.

28335689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602934.

The product of its digits is 311040, while the sum is 44.

The square root of 28335689 is about 5323.1277459779. The cubic root of 28335689 is about 304.8675910075.

The spelling of 28335689 in words is "twenty-eight million, three hundred thirty-five thousand, six hundred eighty-nine".