685221835 has 8 divisors (see below), whose sum is σ = 822473856. Its totient is φ = 548039040.

The previous prime is 685221829. The next prime is 685221847. The reversal of 685221835 is 538122586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 685221835 - 2³ = 685221827 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7782 + ... + 37828.

It is an arithmetic number, because the mean of its divisors is an integer number (102809232).

Almost surely, 2^685221835 is an apocalyptic number.

685221835 is a deficient number, since it is larger than the sum of its proper divisors (137252021).

685221835 is a wasteful number, since it uses less digits than its factorization.

685221835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34613.

The product of its digits is 115200, while the sum is 40.

The square root of 685221835 is about 26176.7422533821. The cubic root of 685221835 is about 881.6111303640.

The spelling of 685221835 in words is "six hundred eighty-five million, two hundred twenty-one thousand, eight hundred thirty-five".