687635453889 has 12 divisors (see below), whose sum is σ = 1020095838996. Its totient is φ = 446033807712.

The previous prime is 687635453833. The next prime is 687635453909. The reversal of 687635453889 is 988354536786.

It is a happy number.

687635453889 is a `hidden beast` number, since 6 + 8 + 7 + 6 + 3 + 5 + 4 + 538 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 583940505600 + 103694948289 = 764160^2 + 322017^2 .

It is not a de Polignac number, because 687635453889 - 2⁸ = 687635453633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687635451889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1032485334 + ... + 1032485999.

It is an arithmetic number, because the mean of its divisors is an integer number (85007986583).

Almost surely, 2^687635453889 is an apocalyptic number.

It is an amenable number.

687635453889 is a deficient number, since it is larger than the sum of its proper divisors (332460385107).

687635453889 is a wasteful number, since it uses less digits than its factorization.

687635453889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064971376 (or 2064971373 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 72.

The spelling of 687635453889 in words is "six hundred eighty-seven billion, six hundred thirty-five million, four hundred fifty-three thousand, eight hundred eighty-nine".