685107187 has 24 divisors (see below), whose sum is σ = 765722880. Its totient is φ = 610117200.

The previous prime is 685107169. The next prime is 685107211. The reversal of 685107187 is 781701586.

It is not a de Polignac number, because 685107187 - 2²⁷ = 550889459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685107127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2202762 + ... + 2203072.

It is an arithmetic number, because the mean of its divisors is an integer number (31905120).

Almost surely, 2^685107187 is an apocalyptic number.

685107187 is a deficient number, since it is larger than the sum of its proper divisors (80615693).

685107187 is a wasteful number, since it uses less digits than its factorization.

685107187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 424 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 43.

The square root of 685107187 is about 26174.5522788834. The cubic root of 685107187 is about 881.5619586528.

The spelling of 685107187 in words is "six hundred eighty-five million, one hundred seven thousand, one hundred eighty-seven".