28965823 has 4 divisors (see below), whose sum is σ = 30490360. Its totient is φ = 27441288.

The previous prime is 28965821. The next prime is 28965829. The reversal of 28965823 is 32856982.

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 28965823 - 2¹ = 28965821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28965823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28965821) 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, 762240 + ... + 762277.

It is an arithmetic number, because the mean of its divisors is an integer number (7622590).

Almost surely, 2^28965823 is an apocalyptic number.

28965823 is a deficient number, since it is larger than the sum of its proper divisors (1524537).

28965823 is a wasteful number, since it uses less digits than its factorization.

28965823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524536.

The product of its digits is 207360, while the sum is 43.

The square root of 28965823 is about 5381.9906168629. The cubic root of 28965823 is about 307.1109425131.

The spelling of 28965823 in words is "twenty-eight million, nine hundred sixty-five thousand, eight hundred twenty-three".