685523447 has 4 divisors (see below), whose sum is σ = 783455376. Its totient is φ = 587591520.

The previous prime is 685523437. The next prime is 685523471. The reversal of 685523447 is 744325586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 685523447 - 2⁸ = 685523191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685523398 and 685523407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685523407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48965954 + ... + 48965967.

It is an arithmetic number, because the mean of its divisors is an integer number (195863844).

Almost surely, 2^685523447 is an apocalyptic number.

685523447 is a deficient number, since it is larger than the sum of its proper divisors (97931929).

685523447 is an equidigital number, since it uses as much as digits as its factorization.

685523447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97931928.

The product of its digits is 806400, while the sum is 44.

The square root of 685523447 is about 26182.5026878639. The cubic root of 685523447 is about 881.7404634150.

The spelling of 685523447 in words is "six hundred eighty-five million, five hundred twenty-three thousand, four hundred forty-seven".