685984266 has 24 divisors (see below), whose sum is σ = 1621417824. Its totient is φ = 207873960.

The previous prime is 685984237. The next prime is 685984297. The reversal of 685984266 is 662489586.

It is a happy number.

685984266 is a `hidden beast` number, since 6 + 8 + 598 + 42 + 6 + 6 = 666.

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, 1732086 + ... + 1732481.

It is an arithmetic number, because the mean of its divisors is an integer number (67559076).

Almost surely, 2^685984266 is an apocalyptic number.

685984266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

685984266 is an abundant number, since it is smaller than the sum of its proper divisors (935433558).

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

685984266 is a wasteful number, since it uses less digits than its factorization.

685984266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464586 (or 3464583 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 685984266 is about 26191.3013422396. The cubic root of 685984266 is about 881.9379921545.

It can be divided in two parts, 6859 and 84266, that added together give a cube (91125 = 45³).

The spelling of 685984266 in words is "six hundred eighty-five million, nine hundred eighty-four thousand, two hundred sixty-six".