28205806 has 8 divisors (see below), whose sum is σ = 43767720. Its totient is φ = 13616568.

The previous prime is 28205789. The next prime is 28205809. The reversal of 28205806 is 60850282.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28205809) 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, 243096 + ... + 243211.

It is an arithmetic number, because the mean of its divisors is an integer number (5470965).

Almost surely, 2^28205806 is an apocalyptic number.

28205806 is a deficient number, since it is larger than the sum of its proper divisors (15561914).

28205806 is a wasteful number, since it uses less digits than its factorization.

28205806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486338.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28205806 is about 5310.9138573319. The cubic root of 28205806 is about 304.4010677639.

The spelling of 28205806 in words is "twenty-eight million, two hundred five thousand, eight hundred six".