688548457 has 2 divisors, whose sum is σ = 688548458. Its totient is φ = 688548456.

The previous prime is 688548451. The next prime is 688548461. The reversal of 688548457 is 754845886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478559376 + 209989081 = 21876^2 + 14491^2 .

It is a cyclic number.

It is not a de Polignac number, because 688548457 - 2¹¹ = 688546409 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 688548398 and 688548407.

It is not a weakly prime, because it can be changed into another prime (688548451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344274228 + 344274229.

It is an arithmetic number, because the mean of its divisors is an integer number (344274229).

Almost surely, 2^688548457 is an apocalyptic number.

It is an amenable number.

688548457 is a deficient number, since it is larger than the sum of its proper divisors (1).

688548457 is an equidigital number, since it uses as much as digits as its factorization.

688548457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8601600, while the sum is 55.

The square root of 688548457 is about 26240.2068779955. The cubic root of 688548457 is about 883.0355127319.

The spelling of 688548457 in words is "six hundred eighty-eight million, five hundred forty-eight thousand, four hundred fifty-seven".