28783859 has 8 divisors (see below), whose sum is σ = 31039680. Its totient is φ = 26534016.

The previous prime is 28783849. The next prime is 28783861. The reversal of 28783859 is 95838782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28783859 - 2²⁰ = 27735283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28783829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18587 + ... + 20075.

It is an arithmetic number, because the mean of its divisors is an integer number (3879960).

Almost surely, 2^28783859 is an apocalyptic number.

28783859 is a deficient number, since it is larger than the sum of its proper divisors (2255821).

28783859 is a wasteful number, since it uses less digits than its factorization.

28783859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2989.

The product of its digits is 967680, while the sum is 50.

The square root of 28783859 is about 5365.0590863475. The cubic root of 28783859 is about 306.4664983648.

The spelling of 28783859 in words is "twenty-eight million, seven hundred eighty-three thousand, eight hundred fifty-nine".