688639611 has 16 divisors (see below), whose sum is σ = 1033970688. Its totient is φ = 403893600.

The previous prime is 688639607. The next prime is 688639639. The reversal of 688639611 is 116936886.

It is not a de Polignac number, because 688639611 - 2² = 688639607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688637611) 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 15 ways as a sum of consecutive naturals, for example, 335556 + ... + 337601.

It is an arithmetic number, because the mean of its divisors is an integer number (64623168).

Almost surely, 2^688639611 is an apocalyptic number.

688639611 is a deficient number, since it is larger than the sum of its proper divisors (345331077).

688639611 is a wasteful number, since it uses less digits than its factorization.

688639611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673202.

The product of its digits is 373248, while the sum is 48.

The square root of 688639611 is about 26241.9437351733. The cubic root of 688639611 is about 883.0744781170.

The spelling of 688639611 in words is "six hundred eighty-eight million, six hundred thirty-nine thousand, six hundred eleven".