685655406 has 24 divisors (see below), whose sum is σ = 1486170504. Its totient is φ = 228462000.

The previous prime is 685655393. The next prime is 685655417. The reversal of 685655406 is 604556586.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52660 + ... + 64376.

It is an arithmetic number, because the mean of its divisors is an integer number (61923771).

Almost surely, 2^685655406 is an apocalyptic number.

685655406 is an abundant number, since it is smaller than the sum of its proper divisors (800515098).

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

685655406 is a wasteful number, since it uses less digits than its factorization.

685655406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14976 (or 14973 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The square root of 685655406 is about 26185.0225510692. The cubic root of 685655406 is about 881.7970363036.

The spelling of 685655406 in words is "six hundred eighty-five million, six hundred fifty-five thousand, four hundred six".