688484887 has 4 divisors (see below), whose sum is σ = 728984016. Its totient is φ = 647985760.

The previous prime is 688484873. The next prime is 688484897. The reversal of 688484887 is 788484886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 688484887 - 2²⁷ = 554267159 is a prime.

It is a super-2 number, since 2×688484887² = 948022879254805538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688484807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20249539 + ... + 20249572.

It is an arithmetic number, because the mean of its divisors is an integer number (182246004).

Almost surely, 2^688484887 is an apocalyptic number.

688484887 is a deficient number, since it is larger than the sum of its proper divisors (40499129).

688484887 is a wasteful number, since it uses less digits than its factorization.

688484887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40499128.

The product of its digits is 22020096, while the sum is 61.

The square root of 688484887 is about 26238.9955409882. The cubic root of 688484887 is about 883.0083365786.

Subtracting 688484887 from its reverse (788484886), we obtain a palindrome (99999999).

The spelling of 688484887 in words is "six hundred eighty-eight million, four hundred eighty-four thousand, eight hundred eighty-seven".