684808461 has 12 divisors (see below), whose sum is σ = 989394588. Its totient is φ = 456434304.

The previous prime is 684808459. The next prime is 684808483. The reversal of 684808461 is 164808486.

It can be written as a sum of positive squares in 2 ways, for example, as 295496100 + 389312361 = 17190^2 + 19731^2 .

It is not a de Polignac number, because 684808461 - 2¹ = 684808459 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684808441) 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 11 ways as a sum of consecutive naturals, for example, 73861 + ... + 82613.

It is an arithmetic number, because the mean of its divisors is an integer number (82449549).

Almost surely, 2^684808461 is an apocalyptic number.

It is an amenable number.

684808461 is a deficient number, since it is larger than the sum of its proper divisors (304586127).

684808461 is a wasteful number, since it uses less digits than its factorization.

684808461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17452 (or 17449 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The square root of 684808461 is about 26168.8452362728. The cubic root of 684808461 is about 881.4338114240.

The spelling of 684808461 in words is "six hundred eighty-four million, eight hundred eight thousand, four hundred sixty-one".