687495920 has 80 divisors (see below), whose sum is σ = 1630312320. Its totient is φ = 269568000.

The previous prime is 687495901. The next prime is 687495923. The reversal of 687495920 is 29594786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687495923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1143620 + ... + 1144220.

It is an arithmetic number, because the mean of its divisors is an integer number (20378904).

Almost surely, 2^687495920 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 687495920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815156160).

687495920 is an abundant number, since it is smaller than the sum of its proper divisors (942816400).

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

687495920 is a wasteful number, since it uses less digits than its factorization.

687495920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 687495920 is about 26220.1434015911. The cubic root of 687495920 is about 882.5853379103.

The spelling of 687495920 in words is "six hundred eighty-seven million, four hundred ninety-five thousand, nine hundred twenty".