668090785 has 16 divisors (see below), whose sum is σ = 821392704. Its totient is φ = 521381952.

The previous prime is 668090779. The next prime is 668090789. The reversal of 668090785 is 587090866.

It is a cyclic number.

It is not a de Polignac number, because 668090785 - 2⁹ = 668090273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668090789) by changing a digit.

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, 233574 + ... + 236416.

It is an arithmetic number, because the mean of its divisors is an integer number (51337044).

Almost surely, 2^668090785 is an apocalyptic number.

It is an amenable number.

668090785 is a deficient number, since it is larger than the sum of its proper divisors (153301919).

668090785 is a wasteful number, since it uses less digits than its factorization.

668090785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3984.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 668090785 is about 25847.4521955260. The cubic root of 668090785 is about 874.2020633090.

The spelling of 668090785 in words is "six hundred sixty-eight million, ninety thousand, seven hundred eighty-five".