688864670 has 32 divisors (see below), whose sum is σ = 1336547520. Its totient is φ = 254119680.

The previous prime is 688864639. The next prime is 688864699. The reversal of 688864670 is 76468886.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 222191 + ... + 225269.

It is an arithmetic number, because the mean of its divisors is an integer number (41767110).

Almost surely, 2^688864670 is an apocalyptic number.

688864670 is a deficient number, since it is larger than the sum of its proper divisors (647682850).

688864670 is a wasteful number, since it uses less digits than its factorization.

688864670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4820.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The square root of 688864670 is about 26246.2315390229. The cubic root of 688864670 is about 883.1706688331.

The spelling of 688864670 in words is "six hundred eighty-eight million, eight hundred sixty-four thousand, six hundred seventy".