688861347 has 4 divisors (see below), whose sum is σ = 918481800. Its totient is φ = 459240896.

The previous prime is 688861307. The next prime is 688861351. The reversal of 688861347 is 743168886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 688861347 - 2⁸ = 688861091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 688861347.

It is not an unprimeable number, because it can be changed into a prime (688861307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114810222 + ... + 114810227.

It is an arithmetic number, because the mean of its divisors is an integer number (229620450).

Almost surely, 2^688861347 is an apocalyptic number.

688861347 is a deficient number, since it is larger than the sum of its proper divisors (229620453).

688861347 is a wasteful number, since it uses less digits than its factorization.

688861347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229620452.

The product of its digits is 1548288, while the sum is 51.

The square root of 688861347 is about 26246.1682346205. The cubic root of 688861347 is about 883.1692487279.

The spelling of 688861347 in words is "six hundred eighty-eight million, eight hundred sixty-one thousand, three hundred forty-seven".