685163408 has 20 divisors (see below), whose sum is σ = 1397373360. Its totient is φ = 324550944.

The previous prime is 685163371. The next prime is 685163417. The reversal of 685163408 is 804361586.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1126610 + ... + 1127217.

It is an arithmetic number, because the mean of its divisors is an integer number (69868668).

Almost surely, 2^685163408 is an apocalyptic number.

It is an amenable number.

685163408 is an abundant number, since it is smaller than the sum of its proper divisors (712209952).

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

685163408 is a wasteful number, since it uses less digits than its factorization.

685163408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253854 (or 2253848 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 685163408 is about 26175.6262198252. The cubic root of 685163408 is about 881.5860721249.

The spelling of 685163408 in words is "six hundred eighty-five million, one hundred sixty-three thousand, four hundred eight".