687669551220 has 96 divisors (see below), whose sum is σ = 2009431307520. Its totient is φ = 175384591360.

The previous prime is 687669551213. The next prime is 687669551237. The reversal of 687669551220 is 22155966786.

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, 13859416 + ... + 13908944.

It is an arithmetic number, because the mean of its divisors is an integer number (20931576120).

Almost surely, 2^687669551220 is an apocalyptic number.

687669551220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687669551220 is an abundant number, since it is smaller than the sum of its proper divisors (1321761756300).

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

687669551220 is a wasteful number, since it uses less digits than its factorization.

687669551220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59625 (or 59623 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 57.

The spelling of 687669551220 in words is "six hundred eighty-seven billion, six hundred sixty-nine million, five hundred fifty-one thousand, two hundred twenty".