687556020 has 96 divisors (see below), whose sum is σ = 2014629120. Its totient is φ = 174873600.

The previous prime is 687556013. The next prime is 687556031. The reversal of 687556020 is 20655786.

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 687556020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 828966 + ... + 829794.

It is an arithmetic number, because the mean of its divisors is an integer number (20985720).

Almost surely, 2^687556020 is an apocalyptic number.

687556020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687556020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1007314560).

687556020 is an abundant number, since it is smaller than the sum of its proper divisors (1327073100).

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

687556020 is a wasteful number, since it uses less digits than its factorization.

687556020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 687556020 is about 26221.2894419782. The cubic root of 687556020 is about 882.6110553154.

The spelling of 687556020 in words is "six hundred eighty-seven million, five hundred fifty-six thousand, twenty".