685140889 has 8 divisors (see below), whose sum is σ = 711993600. Its totient is φ = 658585200.

The previous prime is 685140871. The next prime is 685140899. The reversal of 685140889 is 988041586.

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 685140889 - 2²¹ = 683043737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685140899) 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, 69547 + ... + 78784.

It is an arithmetic number, because the mean of its divisors is an integer number (88999200).

Almost surely, 2^685140889 is an apocalyptic number.

It is an amenable number.

685140889 is a deficient number, since it is larger than the sum of its proper divisors (26852711).

685140889 is a wasteful number, since it uses less digits than its factorization.

685140889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148511.

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 685140889 is about 26175.1960642132. The cubic root of 685140889 is about 881.5764137699.

The spelling of 685140889 in words is "six hundred eighty-five million, one hundred forty thousand, eight hundred eighty-nine".