687500631875 has 20 divisors (see below), whose sum is σ = 870869351352. Its totient is φ = 542466216000.

The previous prime is 687500631871. The next prime is 687500631901. The reversal of 687500631875 is 578136005786.

It is not a de Polignac number, because 687500631875 - 2² = 687500631871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687500631875.

It is not an unprimeable number, because it can be changed into a prime (687500631871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7488629 + ... + 7579878.

Almost surely, 2^687500631875 is an apocalyptic number.

687500631875 is a deficient number, since it is larger than the sum of its proper divisors (183368719477).

687500631875 is an equidigital number, since it uses as much as digits as its factorization.

687500631875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15068600 (or 15068585 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 687500631875 in words is "six hundred eighty-seven billion, five hundred million, six hundred thirty-one thousand, eight hundred seventy-five".