687439765220 has 48 divisors (see below), whose sum is σ = 1574350901760. Its totient is φ = 250610944896.

The previous prime is 687439765219. The next prime is 687439765223. The reversal of 687439765220 is 22567934786.

It is a self number, because there is not a number n which added to its sum of digits gives 687439765220.

It is not an unprimeable number, because it can be changed into a prime (687439765223) 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, 16713632 + ... + 16754711.

It is an arithmetic number, because the mean of its divisors is an integer number (32798977120).

Almost surely, 2^687439765220 is an apocalyptic number.

It is an amenable number.

687439765220 is an abundant number, since it is smaller than the sum of its proper divisors (886911136540).

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

687439765220 is a wasteful number, since it uses less digits than its factorization.

687439765220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33468444 (or 33468442 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 687439765220 in words is "six hundred eighty-seven billion, four hundred thirty-nine million, seven hundred sixty-five thousand, two hundred twenty".