685654158 has 48 divisors (see below), whose sum is σ = 1601979984. Its totient is φ = 195068160.

The previous prime is 685654157. The next prime is 685654169. The reversal of 685654158 is 851456586.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685654157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66016 + ... + 75692.

It is an arithmetic number, because the mean of its divisors is an integer number (33374583).

Almost surely, 2^685654158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685654158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800989992).

685654158 is an abundant number, since it is smaller than the sum of its proper divisors (916325826).

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

685654158 is a wasteful number, since it uses less digits than its factorization.

685654158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9937 (or 9930 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 48.

The square root of 685654158 is about 26184.9987206416. The cubic root of 685654158 is about 881.7965013005.

The spelling of 685654158 in words is "six hundred eighty-five million, six hundred fifty-four thousand, one hundred fifty-eight".