688675679 has 2 divisors, whose sum is σ = 688675680. Its totient is φ = 688675678.

The previous prime is 688675667. The next prime is 688675703. The reversal of 688675679 is 976576886.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688675679 is a prime.

It is a super-2 number, since 2×688675679² = 948548381692222082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688675619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344337839 + 344337840.

It is an arithmetic number, because the mean of its divisors is an integer number (344337840).

Almost surely, 2^688675679 is an apocalyptic number.

688675679 is a deficient number, since it is larger than the sum of its proper divisors (1).

688675679 is an equidigital number, since it uses as much as digits as its factorization.

688675679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 62.

The square root of 688675679 is about 26242.6309466105. The cubic root of 688675679 is about 883.0898950703.

The spelling of 688675679 in words is "six hundred eighty-eight million, six hundred seventy-five thousand, six hundred seventy-nine".