688649158 has 16 divisors (see below), whose sum is σ = 1099856880. Its totient is φ = 322256896.

The previous prime is 688649153. The next prime is 688649173. The reversal of 688649158 is 851946886.

It is a junction number, because it is equal to n+sod(n) for n = 688649099 and 688649108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688649153) 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, 50491 + ... + 62662.

It is an arithmetic number, because the mean of its divisors is an integer number (68741055).

Almost surely, 2^688649158 is an apocalyptic number.

688649158 is a deficient number, since it is larger than the sum of its proper divisors (411207722).

688649158 is a wasteful number, since it uses less digits than its factorization.

688649158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113351.

The product of its digits is 3317760, while the sum is 55.

The square root of 688649158 is about 26242.1256379890. The cubic root of 688649158 is about 883.0785589516.

The spelling of 688649158 in words is "six hundred eighty-eight million, six hundred forty-nine thousand, one hundred fifty-eight".