686328461 has 24 divisors (see below), whose sum is σ = 865025280. Its totient is φ = 530270496.

The previous prime is 686328457. The next prime is 686328463. The reversal of 686328461 is 164823686.

It is not a de Polignac number, because 686328461 - 2² = 686328457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686328463) 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 23 ways as a sum of consecutive naturals, for example, 166220 + ... + 170298.

It is an arithmetic number, because the mean of its divisors is an integer number (36042720).

Almost surely, 2^686328461 is an apocalyptic number.

It is an amenable number.

686328461 is a deficient number, since it is larger than the sum of its proper divisors (178696819).

686328461 is a wasteful number, since it uses less digits than its factorization.

686328461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4185 (or 4142 counting only the distinct ones).

The product of its digits is 331776, while the sum is 44.

The square root of 686328461 is about 26197.8713066539. The cubic root of 686328461 is about 882.0854726464.

The spelling of 686328461 in words is "six hundred eighty-six million, three hundred twenty-eight thousand, four hundred sixty-one".