688342847 has 2 divisors, whose sum is σ = 688342848. Its totient is φ = 688342846.

The previous prime is 688342843. The next prime is 688342861. The reversal of 688342847 is 748243886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688342847 - 2² = 688342843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688342795 and 688342804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688342841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344171423 + 344171424.

It is an arithmetic number, because the mean of its divisors is an integer number (344171424).

Almost surely, 2^688342847 is an apocalyptic number.

688342847 is a deficient number, since it is larger than the sum of its proper divisors (1).

688342847 is an equidigital number, since it uses as much as digits as its factorization.

688342847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2064384, while the sum is 50.

The square root of 688342847 is about 26236.2887428843. The cubic root of 688342847 is about 882.9476084819.

The spelling of 688342847 in words is "six hundred eighty-eight million, three hundred forty-two thousand, eight hundred forty-seven".