686785345 has 4 divisors (see below), whose sum is σ = 824142420. Its totient is φ = 549428272.

The previous prime is 686785339. The next prime is 686785361. The reversal of 686785345 is 543587686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165302449 + 521482896 = 12857^2 + 22836^2 .

It is a cyclic number.

It is not a de Polignac number, because 686785345 - 2⁷ = 686785217 is a prime.

It is a super-2 number, since 2×686785345² = 943348220213538050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 686785292 and 686785301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68678530 + ... + 68678539.

It is an arithmetic number, because the mean of its divisors is an integer number (206035605).

Almost surely, 2^686785345 is an apocalyptic number.

It is an amenable number.

686785345 is a deficient number, since it is larger than the sum of its proper divisors (137357075).

686785345 is a wasteful number, since it uses less digits than its factorization.

686785345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137357074.

The product of its digits is 4838400, while the sum is 52.

The square root of 686785345 is about 26206.5897247238. The cubic root of 686785345 is about 882.2811619156.

The spelling of 686785345 in words is "six hundred eighty-six million, seven hundred eighty-five thousand, three hundred forty-five".