687081349 has 8 divisors (see below), whose sum is σ = 692132480. Its totient is φ = 682040736.

The previous prime is 687081337. The next prime is 687081377. The reversal of 687081349 is 943180786.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687081349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687081299 and 687081308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687081389) 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 7 ways as a sum of consecutive naturals, for example, 167329 + ... + 171385.

It is an arithmetic number, because the mean of its divisors is an integer number (86516560).

Almost surely, 2^687081349 is an apocalyptic number.

It is an amenable number.

687081349 is a deficient number, since it is larger than the sum of its proper divisors (5051131).

687081349 is a wasteful number, since it uses less digits than its factorization.

687081349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5259.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 687081349 is about 26212.2366271938. The cubic root of 687081349 is about 882.4078978961.

The spelling of 687081349 in words is "six hundred eighty-seven million, eighty-one thousand, three hundred forty-nine".