686321345 has 8 divisors (see below), whose sum is σ = 843673320. Its totient is φ = 535665280.

The previous prime is 686321341. The next prime is 686321353. The reversal of 686321345 is 543123686.

It can be written as a sum of positive squares in 4 ways, for example, as 72471169 + 613850176 = 8513^2 + 24776^2 .

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

It is not a de Polignac number, because 686321345 - 2² = 686321341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 686321299 and 686321308.

It is not an unprimeable number, because it can be changed into a prime (686321341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1673750 + ... + 1674159.

It is an arithmetic number, because the mean of its divisors is an integer number (105459165).

Almost surely, 2^686321345 is an apocalyptic number.

It is an amenable number.

686321345 is a deficient number, since it is larger than the sum of its proper divisors (157351975).

686321345 is a wasteful number, since it uses less digits than its factorization.

686321345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347955.

The product of its digits is 103680, while the sum is 38.

The square root of 686321345 is about 26197.7354937407. The cubic root of 686321345 is about 882.0824240857.

The spelling of 686321345 in words is "six hundred eighty-six million, three hundred twenty-one thousand, three hundred forty-five".