688946868 has 36 divisors (see below), whose sum is σ = 1778562240. Its totient is φ = 224762256.

The previous prime is 688946857. The next prime is 688946893. The reversal of 688946868 is 868649886.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201898 + ... + 205281.

Almost surely, 2^688946868 is an apocalyptic number.

It is an amenable number.

688946868 is an abundant number, since it is smaller than the sum of its proper divisors (1089615372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688946868 is a wasteful number, since it uses less digits than its factorization.

688946868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407236 (or 407231 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 63.

The square root of 688946868 is about 26247.7973933052. The cubic root of 688946868 is about 883.2057952174.

The spelling of 688946868 in words is "six hundred eighty-eight million, nine hundred forty-six thousand, eight hundred sixty-eight".