685918289 has 8 divisors (see below), whose sum is σ = 787188480. Its totient is φ = 585468576.

The previous prime is 685918271. The next prime is 685918301. The reversal of 685918289 is 982819586.

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

It is not a de Polignac number, because 685918289 - 2²⁸ = 417482833 is a prime.

It is a super-3 number, since 3×685918289³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685914289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203324 + ... + 206669.

It is an arithmetic number, because the mean of its divisors is an integer number (98398560).

Almost surely, 2^685918289 is an apocalyptic number.

It is an amenable number.

685918289 is a deficient number, since it is larger than the sum of its proper divisors (101270191).

685918289 is a wasteful number, since it uses less digits than its factorization.

685918289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410239.

The product of its digits is 2488320, while the sum is 56.

The square root of 685918289 is about 26190.0417907265. The cubic root of 685918289 is about 881.9097167303.

The spelling of 685918289 in words is "six hundred eighty-five million, nine hundred eighteen thousand, two hundred eighty-nine".