28644683 has 4 divisors (see below), whose sum is σ = 29890128. Its totient is φ = 27399240.

The previous prime is 28644659. The next prime is 28644701. The reversal of 28644683 is 38644682.

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 28644683 - 2⁶ = 28644619 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 28644683.

It is not an unprimeable number, because it can be changed into a prime (28644613) 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 in 3 ways as a sum of consecutive naturals, for example, 622688 + ... + 622733.

It is an arithmetic number, because the mean of its divisors is an integer number (7472532).

Almost surely, 2^28644683 is an apocalyptic number.

28644683 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28644683 is a deficient number, since it is larger than the sum of its proper divisors (1245445).

28644683 is a wasteful number, since it uses less digits than its factorization.

28644683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245444.

The product of its digits is 221184, while the sum is 41.

The square root of 28644683 is about 5352.0727760373. The cubic root of 28644683 is about 305.9717568305.

Subtracting 28644683 from its reverse (38644682), we obtain a palindrome (9999999).

The spelling of 28644683 in words is "twenty-eight million, six hundred forty-four thousand, six hundred eighty-three".