687808379064 has 64 divisors (see below), whose sum is σ = 1726043529600. Its totient is φ = 228400988544.

The previous prime is 687808379053. The next prime is 687808379081. The reversal of 687808379064 is 460973808786.

It is a super-2 number, since 2×687808379064² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 687808378986 and 687808379004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9265407 + ... + 9339345.

It is an arithmetic number, because the mean of its divisors is an integer number (26969430150).

Almost surely, 2^687808379064 is an apocalyptic number.

It is an amenable number.

687808379064 is an abundant number, since it is smaller than the sum of its proper divisors (1038235150536).

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

687808379064 is a wasteful number, since it uses less digits than its factorization.

687808379064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75412 (or 75408 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 66.

The spelling of 687808379064 in words is "six hundred eighty-seven billion, eight hundred eight million, three hundred seventy-nine thousand, sixty-four".