641769685 has 16 divisors (see below), whose sum is σ = 777845376. Its totient is φ = 508292928.

The previous prime is 641769677. The next prime is 641769691. The reversal of 641769685 is 586967146.

It is a cyclic number.

It is not a de Polignac number, because 641769685 - 2³ = 641769677 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239664 + ... + 242326.

It is an arithmetic number, because the mean of its divisors is an integer number (48615336).

Almost surely, 2^641769685 is an apocalyptic number.

It is an amenable number.

641769685 is a deficient number, since it is larger than the sum of its proper divisors (136075691).

641769685 is a wasteful number, since it uses less digits than its factorization.

641769685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132.

The product of its digits is 2177280, while the sum is 52.

The square root of 641769685 is about 25333.1736069526. The cubic root of 641769685 is about 862.5674514216.

The spelling of 641769685 in words is "six hundred forty-one million, seven hundred sixty-nine thousand, six hundred eighty-five".