688157108 has 12 divisors (see below), whose sum is σ = 1205131200. Its totient is φ = 343833912.

The previous prime is 688157101. The next prime is 688157131. The reversal of 688157108 is 801751886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688157101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54758 + ... + 66141.

It is an arithmetic number, because the mean of its divisors is an integer number (100427600).

Almost surely, 2^688157108 is an apocalyptic number.

It is an amenable number.

688157108 is a deficient number, since it is larger than the sum of its proper divisors (516974092).

688157108 is a wasteful number, since it uses less digits than its factorization.

688157108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122326 (or 122324 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 44.

The square root of 688157108 is about 26232.7487694294. The cubic root of 688157108 is about 882.8681846117.

The spelling of 688157108 in words is "six hundred eighty-eight million, one hundred fifty-seven thousand, one hundred eight".