685676587 has 4 divisors (see below), whose sum is σ = 685840456. Its totient is φ = 685512720.

The previous prime is 685676573. The next prime is 685676591. The reversal of 685676587 is 785676586.

685676587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685676587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685676527) 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, 75489 + ... + 84082.

It is an arithmetic number, because the mean of its divisors is an integer number (171460114).

Almost surely, 2^685676587 is an apocalyptic number.

685676587 is a deficient number, since it is larger than the sum of its proper divisors (163869).

685676587 is a wasteful number, since it uses less digits than its factorization.

685676587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163868.

The product of its digits is 16934400, while the sum is 58.

The square root of 685676587 is about 26185.4269967094. The cubic root of 685676587 is about 881.8061162538.

Subtracting 685676587 from its reverse (785676586), we obtain a palindrome (99999999).

The spelling of 685676587 in words is "six hundred eighty-five million, six hundred seventy-six thousand, five hundred eighty-seven".