688795667 has 4 divisors (see below), whose sum is σ = 787195056. Its totient is φ = 590396280.

The previous prime is 688795649. The next prime is 688795691. The reversal of 688795667 is 766597886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 766597886 = 2 ⋅383298943.

It is a cyclic number.

It is not a de Polignac number, because 688795667 - 2⁸ = 688795411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688795967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49199684 + ... + 49199697.

It is an arithmetic number, because the mean of its divisors is an integer number (196798764).

Almost surely, 2^688795667 is an apocalyptic number.

688795667 is a deficient number, since it is larger than the sum of its proper divisors (98399389).

688795667 is an equidigital number, since it uses as much as digits as its factorization.

688795667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98399388.

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

The square root of 688795667 is about 26244.9169745305. The cubic root of 688795667 is about 883.1411790251.

The spelling of 688795667 in words is "six hundred eighty-eight million, seven hundred ninety-five thousand, six hundred sixty-seven".