685908220 has 24 divisors (see below), whose sum is σ = 1479338784. Its totient is φ = 266947776.

The previous prime is 685908211. The next prime is 685908241. The reversal of 685908220 is 22809586.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 462712 + ... + 464191.

It is an arithmetic number, because the mean of its divisors is an integer number (61639116).

Almost surely, 2^685908220 is an apocalyptic number.

It is an amenable number.

685908220 is an abundant number, since it is smaller than the sum of its proper divisors (793430564).

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

685908220 is a wasteful number, since it uses less digits than its factorization.

685908220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926949 (or 926947 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 685908220 is about 26189.8495604690. The cubic root of 685908220 is about 881.9054013511.

The spelling of 685908220 in words is "six hundred eighty-five million, nine hundred eight thousand, two hundred twenty".