28643717 has 4 divisors (see below), whose sum is σ = 29889120. Its totient is φ = 27398316.

The previous prime is 28643711. The next prime is 28643729. The reversal of 28643717 is 71734682.

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 28643717 - 2⁶ = 28643653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622667 + ... + 622712.

It is an arithmetic number, because the mean of its divisors is an integer number (7472280).

Almost surely, 2^28643717 is an apocalyptic number.

It is an amenable number.

28643717 is a deficient number, since it is larger than the sum of its proper divisors (1245403).

28643717 is a wasteful number, since it uses less digits than its factorization.

28643717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245402.

The product of its digits is 56448, while the sum is 38.

The square root of 28643717 is about 5351.9825298669. The cubic root of 28643717 is about 305.9683173087.

The spelling of 28643717 in words is "twenty-eight million, six hundred forty-three thousand, seven hundred seventeen".