687689755 has 8 divisors (see below), whose sum is σ = 844419312. Its totient is φ = 537357408.

The previous prime is 687689713. The next prime is 687689773. The reversal of 687689755 is 557986786.

687689755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 687689755 - 2⁹ = 687689243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687689693 and 687689702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1599064 + ... + 1599493.

It is an arithmetic number, because the mean of its divisors is an integer number (105552414).

Almost surely, 2^687689755 is an apocalyptic number.

687689755 is a deficient number, since it is larger than the sum of its proper divisors (156729557).

687689755 is a wasteful number, since it uses less digits than its factorization.

687689755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198605.

The product of its digits is 25401600, while the sum is 61.

The square root of 687689755 is about 26223.8394404786. The cubic root of 687689755 is about 882.6682765134.

The spelling of 687689755 in words is "six hundred eighty-seven million, six hundred eighty-nine thousand, seven hundred fifty-five".