688678881 has 24 divisors (see below), whose sum is σ = 1011161760. Its totient is φ = 416613120.

The previous prime is 688678871. The next prime is 688678967. The reversal of 688678881 is 188876886.

It is not a de Polignac number, because 688678881 - 2⁵ = 688678849 is a prime.

It is a super-2 number, since 2×688678881² = 948557202270824322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (688678801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242890 + ... + 245708.

It is an arithmetic number, because the mean of its divisors is an integer number (42131740).

Almost surely, 2^688678881 is an apocalyptic number.

It is an amenable number.

688678881 is a deficient number, since it is larger than the sum of its proper divisors (322482879).

688678881 is a wasteful number, since it uses less digits than its factorization.

688678881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517 (or 3506 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 60.

The square root of 688678881 is about 26242.6919541422. The cubic root of 688678881 is about 883.0912637114.

The spelling of 688678881 in words is "six hundred eighty-eight million, six hundred seventy-eight thousand, eight hundred eighty-one".