688988371 has 4 divisors (see below), whose sum is σ = 700666200. Its totient is φ = 677310544.

The previous prime is 688988353. The next prime is 688988383. The reversal of 688988371 is 173889886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 173889886 = 2 ⋅86944943.

It is a cyclic number.

It is not a de Polignac number, because 688988371 - 2²⁵ = 655433939 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688988341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5838826 + ... + 5838943.

It is an arithmetic number, because the mean of its divisors is an integer number (175166550).

Almost surely, 2^688988371 is an apocalyptic number.

688988371 is a deficient number, since it is larger than the sum of its proper divisors (11677829).

688988371 is a wasteful number, since it uses less digits than its factorization.

688988371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11677828.

The product of its digits is 4644864, while the sum is 58.

The square root of 688988371 is about 26248.5879810705. The cubic root of 688988371 is about 883.2235299929.

The spelling of 688988371 in words is "six hundred eighty-eight million, nine hundred eighty-eight thousand, three hundred seventy-one".