685359870 has 64 divisors (see below), whose sum is σ = 1775317824. Its totient is φ = 168330240.

The previous prime is 685359863. The next prime is 685359877. The reversal of 685359870 is 78953586.

It is an interprime number because it is at equal distance from previous prime (685359863) and next prime (685359877).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685359877) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 201504 + ... + 204876.

It is an arithmetic number, because the mean of its divisors is an integer number (27739341).

Almost surely, 2^685359870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685359870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887658912).

685359870 is an abundant number, since it is smaller than the sum of its proper divisors (1089957954).

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

685359870 is a wasteful number, since it uses less digits than its factorization.

685359870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3917.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The square root of 685359870 is about 26179.3787168451. The cubic root of 685359870 is about 881.6703253164.

The spelling of 685359870 in words is "six hundred eighty-five million, three hundred fifty-nine thousand, eight hundred seventy".