685133687 has 4 divisors (see below), whose sum is σ = 783009936. Its totient is φ = 587257440.

The previous prime is 685133681. The next prime is 685133719. The reversal of 685133687 is 786331586.

It is a happy number.

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

It is not a de Polignac number, because 685133687 - 2¹² = 685129591 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 (685133681) 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, 48938114 + ... + 48938127.

It is an arithmetic number, because the mean of its divisors is an integer number (195752484).

Almost surely, 2^685133687 is an apocalyptic number.

685133687 is a deficient number, since it is larger than the sum of its proper divisors (97876249).

685133687 is an equidigital number, since it uses as much as digits as its factorization.

685133687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97876248.

The product of its digits is 725760, while the sum is 47.

The square root of 685133687 is about 26175.0584908611. The cubic root of 685133687 is about 881.5733248016.

The spelling of 685133687 in words is "six hundred eighty-five million, one hundred thirty-three thousand, six hundred eighty-seven".