687905244 has 48 divisors (see below), whose sum is σ = 1920651040. Its totient is φ = 211662720.

The previous prime is 687905171. The next prime is 687905261. The reversal of 687905244 is 442509786.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 687905244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243577 + ... + 246384.

Almost surely, 2^687905244 is an apocalyptic number.

It is an amenable number.

687905244 is an abundant number, since it is smaller than the sum of its proper divisors (1232745796).

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

687905244 is a wasteful number, since it uses less digits than its factorization.

687905244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489987 (or 489979 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 687905244 is about 26227.9477656945. The cubic root of 687905244 is about 882.7604621922.

The spelling of 687905244 in words is "six hundred eighty-seven million, nine hundred five thousand, two hundred forty-four".