690328757 has 2 divisors, whose sum is σ = 690328758. Its totient is φ = 690328756.

The previous prime is 690328753. The next prime is 690328759. The reversal of 690328757 is 757823096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617721316 + 72607441 = 24854^2 + 8521^2 .

It is a cyclic number.

It is not a de Polignac number, because 690328757 - 2² = 690328753 is a prime.

Together with 690328759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690328753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345164378 + 345164379.

It is an arithmetic number, because the mean of its divisors is an integer number (345164379).

Almost surely, 2^690328757 is an apocalyptic number.

It is an amenable number.

690328757 is a deficient number, since it is larger than the sum of its proper divisors (1).

690328757 is an equidigital number, since it uses as much as digits as its factorization.

690328757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 690328757 is about 26274.1081104573. The cubic root of 690328757 is about 883.7959119676.

The spelling of 690328757 in words is "six hundred ninety million, three hundred twenty-eight thousand, seven hundred fifty-seven".