688437073 has 2 divisors, whose sum is σ = 688437074. Its totient is φ = 688437072.

The previous prime is 688437053. The next prime is 688437091. The reversal of 688437073 is 370734886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544148929 + 144288144 = 23327^2 + 12012^2 .

It is a cyclic number.

It is not a de Polignac number, because 688437073 - 2¹⁷ = 688306001 is a prime.

It is not a weakly prime, because it can be changed into another prime (688437023) 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, 344218536 + 344218537.

It is an arithmetic number, because the mean of its divisors is an integer number (344218537).

Almost surely, 2^688437073 is an apocalyptic number.

It is an amenable number.

688437073 is a deficient number, since it is larger than the sum of its proper divisors (1).

688437073 is an equidigital number, since it uses as much as digits as its factorization.

688437073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 46.

The square root of 688437073 is about 26238.0844003521. The cubic root of 688437073 is about 882.9878950076.

The spelling of 688437073 in words is "six hundred eighty-eight million, four hundred thirty-seven thousand, seventy-three".