85561805 has 16 divisors (see below), whose sum is σ = 118272000. Its totient is φ = 58205952.

The previous prime is 85561789. The next prime is 85561849. The reversal of 85561805 is 50816558.

It is not a de Polignac number, because 85561805 - 2⁴ = 85561789 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 5180 + ... + 14069.

It is an arithmetic number, because the mean of its divisors is an integer number (7392000).

Almost surely, 2^85561805 is an apocalyptic number.

It is an amenable number.

85561805 is a deficient number, since it is larger than the sum of its proper divisors (32710195).

85561805 is a wasteful number, since it uses less digits than its factorization.

85561805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19388.

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 85561805 is about 9249.9624323561. The cubic root of 85561805 is about 440.6495313874.

The spelling of 85561805 in words is "eighty-five million, five hundred sixty-one thousand, eight hundred five".