685405785 has 8 divisors (see below), whose sum is σ = 1096649280. Its totient is φ = 365549744.

The previous prime is 685405741. The next prime is 685405793. The reversal of 685405785 is 587504586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685405785 - 2¹³ = 685397593 is a prime.

It is a super-2 number, since 2×685405785² = 939562180222932450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22846845 + ... + 22846874.

It is an arithmetic number, because the mean of its divisors is an integer number (137081160).

Almost surely, 2^685405785 is an apocalyptic number.

It is an amenable number.

685405785 is a deficient number, since it is larger than the sum of its proper divisors (411243495).

685405785 is a wasteful number, since it uses less digits than its factorization.

685405785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45693727.

The product of its (nonzero) digits is 1344000, while the sum is 48.

The square root of 685405785 is about 26180.2556328238. The cubic root of 685405785 is about 881.6900137510.

The spelling of 685405785 in words is "six hundred eighty-five million, four hundred five thousand, seven hundred eighty-five".