687171328 has 36 divisors (see below), whose sum is σ = 1443861160. Its totient is φ = 325499904.

The previous prime is 687171319. The next prime is 687171337. The reversal of 687171328 is 823171786.

It is an interprime number because it is at equal distance from previous prime (687171319) and next prime (687171337).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 65775 + ... + 75502.

Almost surely, 2^687171328 is an apocalyptic number.

It is an amenable number.

687171328 is an abundant number, since it is smaller than the sum of its proper divisors (756689832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687171328 is a wasteful number, since it uses less digits than its factorization.

687171328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141312 (or 141298 counting only the distinct ones).

The product of its digits is 112896, while the sum is 43.

The square root of 687171328 is about 26213.9529258752. The cubic root of 687171328 is about 882.4464157585.

The spelling of 687171328 in words is "six hundred eighty-seven million, one hundred seventy-one thousand, three hundred twenty-eight".