688641134 has 16 divisors (see below), whose sum is σ = 1131440400. Its totient is φ = 312891264.

The previous prime is 688641131. The next prime is 688641143. The reversal of 688641134 is 431146886.

688641134 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×688641134³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 688641091 and 688641100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688641131) 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, 348224 + ... + 350195.

It is an arithmetic number, because the mean of its divisors is an integer number (70715025).

Almost surely, 2^688641134 is an apocalyptic number.

688641134 is a deficient number, since it is larger than the sum of its proper divisors (442799266).

688641134 is a wasteful number, since it uses less digits than its factorization.

688641134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698467.

The product of its digits is 110592, while the sum is 41.

The square root of 688641134 is about 26241.9727535870. The cubic root of 688641134 is about 883.0751291210.

The spelling of 688641134 in words is "six hundred eighty-eight million, six hundred forty-one thousand, one hundred thirty-four".