685699740 has 216 divisors, whose sum is σ = 2408012880. Its totient is φ = 157386240.

The previous prime is 685699727. The next prime is 685699771. The reversal of 685699740 is 47996586.

685699740 is a `hidden beast` number, since 6 + 8 + 569 + 9 + 74 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 412992 + ... + 414648.

Almost surely, 2^685699740 is an apocalyptic number.

685699740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685699740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1204006440).

685699740 is an abundant number, since it is smaller than the sum of its proper divisors (1722313140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685699740 is a wasteful number, since it uses less digits than its factorization.

685699740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 685699740 is about 26185.8690900264. The cubic root of 685699740 is about 881.8160413543.

The spelling of 685699740 in words is "six hundred eighty-five million, six hundred ninety-nine thousand, seven hundred forty".