685949586 has 128 divisors (see below), whose sum is σ = 1723023360. Its totient is φ = 177811200.

The previous prime is 685949543. The next prime is 685949587.

685949586 is nontrivially palindromic in base 10.

Its product of digits (18662400) is a multiple of the sum of its prime divisors (600).

It is not an unprimeable number, because it can be changed into a prime (685949587) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1396801 + ... + 1397291.

It is an arithmetic number, because the mean of its divisors is an integer number (13461120).

Almost surely, 2^685949586 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685949586, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861511680).

685949586 is an abundant number, since it is smaller than the sum of its proper divisors (1037073774).

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

685949586 is a wasteful number, since it uses less digits than its factorization.

685949586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600.

The product of its digits is 18662400, while the sum is 60.

The square root of 685949586 is about 26190.6392820030. The cubic root of 685949586 is about 881.9231297510.

The spelling of 685949586 in words is "six hundred eighty-five million, nine hundred forty-nine thousand, five hundred eighty-six".