687777609 has 8 divisors (see below), whose sum is σ = 920842912. Its totient is φ = 456615360.

The previous prime is 687777581. The next prime is 687777689. The reversal of 687777609 is 906777786.

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

It is not a de Polignac number, because 687777609 - 2⁷ = 687777481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687777689) 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, 474919 + ... + 476364.

It is an arithmetic number, because the mean of its divisors is an integer number (115105364).

Almost surely, 2^687777609 is an apocalyptic number.

It is an amenable number.

687777609 is a deficient number, since it is larger than the sum of its proper divisors (233065303).

687777609 is a wasteful number, since it uses less digits than its factorization.

687777609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951527.

The product of its (nonzero) digits is 6223392, while the sum is 57.

The square root of 687777609 is about 26225.5144658785. The cubic root of 687777609 is about 882.7058625693.

The spelling of 687777609 in words is "six hundred eighty-seven million, seven hundred seventy-seven thousand, six hundred nine".