688781127 has 4 divisors (see below), whose sum is σ = 918374840. Its totient is φ = 459187416.

The previous prime is 688781123. The next prime is 688781167. The reversal of 688781127 is 721187886.

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

It is not a de Polignac number, because 688781127 - 2² = 688781123 is a prime.

It is a super-2 number, since 2×688781127² = 948838881822780258, 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 (688781123) 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 3 ways as a sum of consecutive naturals, for example, 114796852 + ... + 114796857.

It is an arithmetic number, because the mean of its divisors is an integer number (229593710).

Almost surely, 2^688781127 is an apocalyptic number.

688781127 is a deficient number, since it is larger than the sum of its proper divisors (229593713).

688781127 is a wasteful number, since it uses less digits than its factorization.

688781127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229593712.

The product of its digits is 301056, while the sum is 48.

The square root of 688781127 is about 26244.6399670485. The cubic root of 688781127 is about 883.1349648149.

The spelling of 688781127 in words is "six hundred eighty-eight million, seven hundred eighty-one thousand, one hundred twenty-seven".