28039859 has 4 divisors (see below), whose sum is σ = 28723800. Its totient is φ = 27355920.

The previous prime is 28039853. The next prime is 28039861. The reversal of 28039859 is 95893082.

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 28039859 - 2⁸ = 28039603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28039853) 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, 341909 + ... + 341990.

It is an arithmetic number, because the mean of its divisors is an integer number (7180950).

Almost surely, 2^28039859 is an apocalyptic number.

28039859 is a deficient number, since it is larger than the sum of its proper divisors (683941).

28039859 is an equidigital number, since it uses as much as digits as its factorization.

28039859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683940.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 28039859 is about 5295.2676041915. The cubic root of 28039859 is about 303.8029186310.

The spelling of 28039859 in words is "twenty-eight million, thirty-nine thousand, eight hundred fifty-nine".