688937479 has 2 divisors, whose sum is σ = 688937480. Its totient is φ = 688937478.

The previous prime is 688937467. The next prime is 688937489. The reversal of 688937479 is 974739886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688937479 - 2⁷ = 688937351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688937419) 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 as a sum of consecutive naturals, namely, 344468739 + 344468740.

It is an arithmetic number, because the mean of its divisors is an integer number (344468740).

Almost surely, 2^688937479 is an apocalyptic number.

688937479 is a deficient number, since it is larger than the sum of its proper divisors (1).

688937479 is an equidigital number, since it uses as much as digits as its factorization.

688937479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 61.

The square root of 688937479 is about 26247.6185395933. The cubic root of 688937479 is about 883.2017830759.

The spelling of 688937479 in words is "six hundred eighty-eight million, nine hundred thirty-seven thousand, four hundred seventy-nine".