685819930 has 8 divisors (see below), whose sum is σ = 1234475892. Its totient is φ = 274327968.

The previous prime is 685819909. The next prime is 685819949. The reversal of 685819930 is 39918586.

It can be written as a sum of positive squares in 2 ways, for example, as 627953481 + 57866449 = 25059^2 + 7607^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34290987 + ... + 34291006.

Almost surely, 2^685819930 is an apocalyptic number.

685819930 is a deficient number, since it is larger than the sum of its proper divisors (548655962).

685819930 is a wasteful number, since it uses less digits than its factorization.

685819930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68582000.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 685819930 is about 26188.1639295312. The cubic root of 685819930 is about 881.8675601518.

The spelling of 685819930 in words is "six hundred eighty-five million, eight hundred nineteen thousand, nine hundred thirty".