685981746 has 24 divisors (see below), whose sum is σ = 1486817280. Its totient is φ = 228580056.

The previous prime is 685981729. The next prime is 685981763. The reversal of 685981746 is 647189586.

685981746 is a `hidden beast` number, since 6 + 8 + 598 + 1 + 7 + 46 = 666.

It is an interprime number because it is at equal distance from previous prime (685981729) and next prime (685981763).

It is a junction number, because it is equal to n+sod(n) for n = 685981692 and 685981701.

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 11 ways as a sum of consecutive naturals, for example, 68751 + ... + 78093.

It is an arithmetic number, because the mean of its divisors is an integer number (61950720).

Almost surely, 2^685981746 is an apocalyptic number.

685981746 is an abundant number, since it is smaller than the sum of its proper divisors (800835534).

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

685981746 is a wasteful number, since it uses less digits than its factorization.

685981746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13430 (or 13427 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 685981746 is about 26191.2532346201. The cubic root of 685981746 is about 881.9369122044.

The spelling of 685981746 in words is "six hundred eighty-five million, nine hundred eighty-one thousand, seven hundred forty-six".