685341649 has 16 divisors (see below), whose sum is σ = 730917504. Its totient is φ = 641203200.

The previous prime is 685341617. The next prime is 685341667. The reversal of 685341649 is 946143586.

It is not a de Polignac number, because 685341649 - 2⁵ = 685341617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685341599 and 685341608.

It is not an unprimeable number, because it can be changed into a prime (685341049) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 269514 + ... + 272044.

It is an arithmetic number, because the mean of its divisors is an integer number (45682344).

Almost surely, 2^685341649 is an apocalyptic number.

It is an amenable number.

685341649 is a deficient number, since it is larger than the sum of its proper divisors (45575855).

685341649 is a wasteful number, since it uses less digits than its factorization.

685341649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808.

The product of its digits is 622080, while the sum is 46.

The square root of 685341649 is about 26179.0307116211. The cubic root of 685341649 is about 881.6625118751.

The spelling of 685341649 in words is "six hundred eighty-five million, three hundred forty-one thousand, six hundred forty-nine".