687387828 has 12 divisors (see below), whose sum is σ = 1603904960. Its totient is φ = 229129272.

The previous prime is 687387817. The next prime is 687387829. The reversal of 687387828 is 828783786.

687387828 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687387829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28641148 + ... + 28641171.

Almost surely, 2^687387828 is an apocalyptic number.

It is an amenable number.

687387828 is an abundant number, since it is smaller than the sum of its proper divisors (916517132).

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

687387828 is a wasteful number, since it uses less digits than its factorization.

687387828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57282326 (or 57282324 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 57.

The square root of 687387828 is about 26218.0820808846. The cubic root of 687387828 is about 882.5390804651.

The spelling of 687387828 in words is "six hundred eighty-seven million, three hundred eighty-seven thousand, eight hundred twenty-eight".