687849620688 has 60 divisors (see below), whose sum is σ = 1925195351040. Its totient is φ = 229262749248.

The previous prime is 687849620677. The next prime is 687849620707. The reversal of 687849620688 is 886026948786.

687849620688 is a `hidden beast` number, since 6 + 8 + 78 + 496 + 2 + 0 + 68 + 8 = 666.

It is a Cunningham number, because it is equal to 829367²-1.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1451395 + ... + 1866077.

It is an arithmetic number, because the mean of its divisors is an integer number (32086589184).

Almost surely, 2^687849620688 is an apocalyptic number.

It is an amenable number.

687849620688 is an abundant number, since it is smaller than the sum of its proper divisors (1237345730352).

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

687849620688 is a wasteful number, since it uses less digits than its factorization.

687849620688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426216 (or 426207 counting only the distinct ones).

The product of its (nonzero) digits is 445906944, while the sum is 72.

The spelling of 687849620688 in words is "six hundred eighty-seven billion, eight hundred forty-nine million, six hundred twenty thousand, six hundred eighty-eight".