28357805 has 8 divisors (see below), whose sum is σ = 38890752. Its totient is φ = 19445328.

The previous prime is 28357793. The next prime is 28357837. The reversal of 28357805 is 50875382.

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

It is not a de Polignac number, because 28357805 - 2⁴ = 28357789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 405077 + ... + 405146.

It is an arithmetic number, because the mean of its divisors is an integer number (4861344).

Almost surely, 2^28357805 is an apocalyptic number.

It is an amenable number.

28357805 is a deficient number, since it is larger than the sum of its proper divisors (10532947).

28357805 is an equidigital number, since it uses as much as digits as its factorization.

28357805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810235.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 28357805 is about 5325.2046909016. The cubic root of 28357805 is about 304.9468867470.

The spelling of 28357805 in words is "twenty-eight million, three hundred fifty-seven thousand, eight hundred five".