685378911 has 8 divisors (see below), whose sum is σ = 1044386944. Its totient is φ = 391645080.

The previous prime is 685378873. The next prime is 685378933. The reversal of 685378911 is 119873586.

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

It is not a de Polignac number, because 685378911 - 2⁶ = 685378847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685378961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16318525 + ... + 16318566.

It is an arithmetic number, because the mean of its divisors is an integer number (130548368).

Almost surely, 2^685378911 is an apocalyptic number.

685378911 is a deficient number, since it is larger than the sum of its proper divisors (359008033).

685378911 is a wasteful number, since it uses less digits than its factorization.

685378911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32637101.

The product of its digits is 362880, while the sum is 48.

The square root of 685378911 is about 26179.7423784116. The cubic root of 685378911 is about 881.6784902382.

The spelling of 685378911 in words is "six hundred eighty-five million, three hundred seventy-eight thousand, nine hundred eleven".