688216873884 has 12 divisors (see below), whose sum is σ = 1605839372424. Its totient is φ = 229405624624.

The previous prime is 688216873859. The next prime is 688216873909. The reversal of 688216873884 is 488378612886.

It is an interprime number because it is at equal distance from previous prime (688216873859) and next prime (688216873909).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×688216873884² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28675703067 + ... + 28675703090.

It is an arithmetic number, because the mean of its divisors is an integer number (133819947702).

Almost surely, 2^688216873884 is an apocalyptic number.

It is an amenable number.

688216873884 is an abundant number, since it is smaller than the sum of its proper divisors (917622498540).

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

688216873884 is a wasteful number, since it uses less digits than its factorization.

688216873884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57351406164 (or 57351406162 counting only the distinct ones).

The product of its digits is 198180864, while the sum is 69.

The spelling of 688216873884 in words is "six hundred eighty-eight billion, two hundred sixteen million, eight hundred seventy-three thousand, eight hundred eighty-four".