687750629 has 2 divisors, whose sum is σ = 687750630. Its totient is φ = 687750628.

The previous prime is 687750607. The next prime is 687750641. The reversal of 687750629 is 926057786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687750625 + 4 = 26225^2 + 2^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687750629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687750829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343875314 + 343875315.

It is an arithmetic number, because the mean of its divisors is an integer number (343875315).

Almost surely, 2^687750629 is an apocalyptic number.

It is an amenable number.

687750629 is a deficient number, since it is larger than the sum of its proper divisors (1).

687750629 is an equidigital number, since it uses as much as digits as its factorization.

687750629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The square root of 687750629 is about 26225.0000762631. Note that the first 4 decimals coincide. The cubic root of 687750629 is about 882.6943202164.

The spelling of 687750629 in words is "six hundred eighty-seven million, seven hundred fifty thousand, six hundred twenty-nine".