690375677 has 2 divisors, whose sum is σ = 690375678. Its totient is φ = 690375676.

The previous prime is 690375619. The next prime is 690375691. The reversal of 690375677 is 776573096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639381796 + 50993881 = 25286^2 + 7141^2 .

It is a cyclic number.

It is not a de Polignac number, because 690375677 - 2¹⁰ = 690374653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690375607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345187838 + 345187839.

It is an arithmetic number, because the mean of its divisors is an integer number (345187839).

Almost surely, 2^690375677 is an apocalyptic number.

It is an amenable number.

690375677 is a deficient number, since it is larger than the sum of its proper divisors (1).

690375677 is an equidigital number, since it uses as much as digits as its factorization.

690375677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1666980, while the sum is 50.

The square root of 690375677 is about 26275.0009895338. Note that the first 3 decimals coincide. The cubic root of 690375677 is about 883.8159346811.

The spelling of 690375677 in words is "six hundred ninety million, three hundred seventy-five thousand, six hundred seventy-seven".