28195805 has 16 divisors (see below), whose sum is σ = 37540800. Its totient is φ = 20156160.

The previous prime is 28195781. The next prime is 28195807. The reversal of 28195805 is 50859182.

It is a de Polignac number, because none of the positive numbers 2^k-28195805 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28195807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1100 + ... + 7589.

It is an arithmetic number, because the mean of its divisors is an integer number (2346300).

Almost surely, 2^28195805 is an apocalyptic number.

It is an amenable number.

28195805 is a deficient number, since it is larger than the sum of its proper divisors (9344995).

28195805 is a wasteful number, since it uses less digits than its factorization.

28195805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8764.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 28195805 is about 5309.9722221496. The cubic root of 28195805 is about 304.3650861063.

The spelling of 28195805 in words is "twenty-eight million, one hundred ninety-five thousand, eight hundred five".