64091785 has 32 divisors (see below), whose sum is σ = 84851712. Its totient is φ = 46279680.

The previous prime is 64091773. The next prime is 64091789. The reversal of 64091785 is 58719046.

It is not a de Polignac number, because 64091785 - 2⁹ = 64091273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64091789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243564 + ... + 243826.

It is an arithmetic number, because the mean of its divisors is an integer number (2651616).

Almost surely, 2^64091785 is an apocalyptic number.

It is an amenable number.

64091785 is a deficient number, since it is larger than the sum of its proper divisors (20759927).

64091785 is a wasteful number, since it uses less digits than its factorization.

64091785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 64091785 is about 8005.7345072142. The cubic root of 64091785 is about 400.1911274112.

The spelling of 64091785 in words is "sixty-four million, ninety-one thousand, seven hundred eighty-five".