687712049 has 8 divisors (see below), whose sum is σ = 733825440. Its totient is φ = 642590496.

The previous prime is 687712043. The next prime is 687712063. The reversal of 687712049 is 940217786.

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

It is a cyclic number.

It is not a de Polignac number, because 687712049 - 2⁸ = 687711793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687712043) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 246527 + ... + 249300.

It is an arithmetic number, because the mean of its divisors is an integer number (91728180).

Almost surely, 2^687712049 is an apocalyptic number.

It is an amenable number.

687712049 is a deficient number, since it is larger than the sum of its proper divisors (46113391).

687712049 is a wasteful number, since it uses less digits than its factorization.

687712049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495919.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 687712049 is about 26224.2645082755. The cubic root of 687712049 is about 882.6778147263.

The spelling of 687712049 in words is "six hundred eighty-seven million, seven hundred twelve thousand, forty-nine".