687999276 has 72 divisors (see below), whose sum is σ = 1821796704. Its totient is φ = 218507520.

The previous prime is 687999251. The next prime is 687999289. The reversal of 687999276 is 672999786.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 231190 + ... + 234146.

It is an arithmetic number, because the mean of its divisors is an integer number (25302732).

Almost surely, 2^687999276 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687999276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910898352).

687999276 is an abundant number, since it is smaller than the sum of its proper divisors (1133797428).

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

687999276 is a wasteful number, since it uses less digits than its factorization.

687999276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271 (or 3266 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 687999276 is about 26229.7402960838. The cubic root of 687999276 is about 882.8006828236.

The spelling of 687999276 in words is "six hundred eighty-seven million, nine hundred ninety-nine thousand, two hundred seventy-six".