688874057 has 2 divisors, whose sum is σ = 688874058. Its totient is φ = 688874056.

The previous prime is 688874009. The next prime is 688874107. The reversal of 688874057 is 750478886.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406264336 + 282609721 = 20156^2 + 16811^2 .

It is a cyclic number.

It is not a de Polignac number, because 688874057 - 2⁶ = 688873993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688874257) 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, 344437028 + 344437029.

It is an arithmetic number, because the mean of its divisors is an integer number (344437029).

Almost surely, 2^688874057 is an apocalyptic number.

It is an amenable number.

688874057 is a deficient number, since it is larger than the sum of its proper divisors (1).

688874057 is an equidigital number, since it uses as much as digits as its factorization.

688874057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3010560, while the sum is 53.

The square root of 688874057 is about 26246.4103640860. The cubic root of 688874057 is about 883.1746804025.

The spelling of 688874057 in words is "six hundred eighty-eight million, eight hundred seventy-four thousand, fifty-seven".