685987329 has 8 divisors (see below), whose sum is σ = 914994432. Its totient is φ = 457152560.

The previous prime is 685987327. The next prime is 685987331. The reversal of 685987329 is 923789586.

It is an interprime number because it is at equal distance from previous prime (685987327) and next prime (685987331).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685987329 - 2¹ = 685987327 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685987327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33489 + ... + 49934.

It is an arithmetic number, because the mean of its divisors is an integer number (114374304).

Almost surely, 2^685987329 is an apocalyptic number.

It is an amenable number.

685987329 is a deficient number, since it is larger than the sum of its proper divisors (229007103).

685987329 is a wasteful number, since it uses less digits than its factorization.

685987329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86167.

The product of its digits is 6531840, while the sum is 57.

The square root of 685987329 is about 26191.3598157866. The cubic root of 685987329 is about 881.9393048047.

The spelling of 685987329 in words is "six hundred eighty-five million, nine hundred eighty-seven thousand, three hundred twenty-nine".