685308650 has 24 divisors (see below), whose sum is σ = 1372727244. Its totient is φ = 253036800.

The previous prime is 685308649. The next prime is 685308671. The reversal of 685308650 is 56803586.

It can be written as a sum of positive squares in 6 ways, for example, as 46280809 + 639027841 = 6803^2 + 25279^2 .

It is a junction number, because it is equal to n+sod(n) for n = 685308598 and 685308607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 526511 + ... + 527810.

Almost surely, 2^685308650 is an apocalyptic number.

685308650 is an abundant number, since it is smaller than the sum of its proper divisors (687418594).

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

685308650 is a wasteful number, since it uses less digits than its factorization.

685308650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054346 (or 1054341 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 685308650 is about 26178.4004476973. The cubic root of 685308650 is about 881.6483610506.

The spelling of 685308650 in words is "six hundred eighty-five million, three hundred eight thousand, six hundred fifty".