687717101440 has 64 divisors (see below), whose sum is σ = 1684173118320. Its totient is φ = 268377395200.

The previous prime is 687717101429. The next prime is 687717101471. The reversal of 687717101440 is 44101717786.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×687717101440² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13078126 + ... + 13130605.

Almost surely, 2^687717101440 is an apocalyptic number.

It is an amenable number.

687717101440 is an abundant number, since it is smaller than the sum of its proper divisors (996456016880).

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

687717101440 is a wasteful number, since it uses less digits than its factorization.

687717101440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26208791 (or 26208779 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 46.

The spelling of 687717101440 in words is "six hundred eighty-seven billion, seven hundred seventeen million, one hundred one thousand, four hundred forty".