688863881 has 8 divisors (see below), whose sum is σ = 701100960. Its totient is φ = 676645632.

The previous prime is 688863863. The next prime is 688863971. The reversal of 688863881 is 188368886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688863881 is a prime.

It is a super-2 number, since 2×688863881² = 949066893092764322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688860881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83561 + ... + 91433.

It is an arithmetic number, because the mean of its divisors is an integer number (87637620).

Almost surely, 2^688863881 is an apocalyptic number.

It is an amenable number.

688863881 is a deficient number, since it is larger than the sum of its proper divisors (12237079).

688863881 is a wasteful number, since it uses less digits than its factorization.

688863881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9415.

The product of its digits is 3538944, while the sum is 56.

The square root of 688863881 is about 26246.2165082893. The cubic root of 688863881 is about 883.1703316493.

The spelling of 688863881 in words is "six hundred eighty-eight million, eight hundred sixty-three thousand, eight hundred eighty-one".