687380345 has 4 divisors (see below), whose sum is σ = 824856420. Its totient is φ = 549904272.

The previous prime is 687380333. The next prime is 687380387. The reversal of 687380345 is 543083786.

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 393189241 + 294191104 = 19829^2 + 17152^2 .

It is a cyclic number.

It is not a de Polignac number, because 687380345 - 2¹⁶ = 687314809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687380296 and 687380305.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 68738030 + ... + 68738039.

It is an arithmetic number, because the mean of its divisors is an integer number (206214105).

Almost surely, 2^687380345 is an apocalyptic number.

It is an amenable number.

687380345 is a deficient number, since it is larger than the sum of its proper divisors (137476075).

687380345 is a wasteful number, since it uses less digits than its factorization.

687380345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137476074.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 687380345 is about 26217.9393736426. The cubic root of 687380345 is about 882.5358779722.

The spelling of 687380345 in words is "six hundred eighty-seven million, three hundred eighty thousand, three hundred forty-five".