685644443 has 6 divisors (see below), whose sum is σ = 753642372. Its totient is φ = 623313020.

The previous prime is 685644439. The next prime is 685644451. The reversal of 685644443 is 344446586.

It is not a de Polignac number, because 685644443 - 2² = 685644439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685644394 and 685644403.

It is not an unprimeable number, because it can be changed into a prime (685644473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2833121 + ... + 2833362.

It is an arithmetic number, because the mean of its divisors is an integer number (125607062).

Almost surely, 2^685644443 is an apocalyptic number.

685644443 is a deficient number, since it is larger than the sum of its proper divisors (67997929).

685644443 is a wasteful number, since it uses less digits than its factorization.

685644443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666505 (or 5666494 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 44.

The square root of 685644443 is about 26184.8132130057. The cubic root of 685644443 is about 881.7923365704.

The spelling of 685644443 in words is "six hundred eighty-five million, six hundred forty-four thousand, four hundred forty-three".