685780761 has 8 divisors (see below), whose sum is σ = 926900320. Its totient is φ = 450924192.

The previous prime is 685780759. The next prime is 685780769. The reversal of 685780761 is 167087586.

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

It is not a de Polignac number, because 685780761 - 2¹ = 685780759 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 685780761.

It is not an unprimeable number, because it can be changed into a prime (685780769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1565491 + ... + 1565928.

It is an arithmetic number, because the mean of its divisors is an integer number (115862540).

Almost surely, 2^685780761 is an apocalyptic number.

It is an amenable number.

685780761 is a deficient number, since it is larger than the sum of its proper divisors (241119559).

685780761 is a wasteful number, since it uses less digits than its factorization.

685780761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131495.

The product of its (nonzero) digits is 564480, while the sum is 48.

The square root of 685780761 is about 26187.4160810111. The cubic root of 685780761 is about 881.8507712317.

The spelling of 685780761 in words is "six hundred eighty-five million, seven hundred eighty thousand, seven hundred sixty-one".