687106855 has 4 divisors (see below), whose sum is σ = 824528232. Its totient is φ = 549685480.

The previous prime is 687106841. The next prime is 687106919. The reversal of 687106855 is 558601786.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 687106855 - 2¹¹ = 687104807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68710681 + ... + 68710690.

It is an arithmetic number, because the mean of its divisors is an integer number (206132058).

Almost surely, 2^687106855 is an apocalyptic number.

687106855 is a deficient number, since it is larger than the sum of its proper divisors (137421377).

687106855 is a wasteful number, since it uses less digits than its factorization.

687106855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137421376.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 687106855 is about 26212.7231511722. The cubic root of 687106855 is about 882.4188167475.

The spelling of 687106855 in words is "six hundred eighty-seven million, one hundred six thousand, eight hundred fifty-five".