688679867 has 2 divisors, whose sum is σ = 688679868. Its totient is φ = 688679866.

The previous prime is 688679699. The next prime is 688679881. The reversal of 688679867 is 768976886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688679867 - 2¹⁴ = 688663483 is a prime.

It is a super-2 number, since 2×688679867² = 948559918422275378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688676867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344339933 + 344339934.

It is an arithmetic number, because the mean of its divisors is an integer number (344339934).

Almost surely, 2^688679867 is an apocalyptic number.

688679867 is a deficient number, since it is larger than the sum of its proper divisors (1).

688679867 is an equidigital number, since it uses as much as digits as its factorization.

688679867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48771072, while the sum is 65.

The square root of 688679867 is about 26242.7107403180. The cubic root of 688679867 is about 883.0916851596.

The spelling of 688679867 in words is "six hundred eighty-eight million, six hundred seventy-nine thousand, eight hundred sixty-seven".