690727837 has 2 divisors, whose sum is σ = 690727838. Its totient is φ = 690727836.

The previous prime is 690727819. The next prime is 690727841. The reversal of 690727837 is 738727096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 503284356 + 187443481 = 22434^2 + 13691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690727837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690727897) 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, 345363918 + 345363919.

It is an arithmetic number, because the mean of its divisors is an integer number (345363919).

Almost surely, 2^690727837 is an apocalyptic number.

It is an amenable number.

690727837 is a deficient number, since it is larger than the sum of its proper divisors (1).

690727837 is an equidigital number, since it uses as much as digits as its factorization.

690727837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 889056, while the sum is 49.

The square root of 690727837 is about 26281.7015621135. The cubic root of 690727837 is about 883.9661870355.

The spelling of 690727837 in words is "six hundred ninety million, seven hundred twenty-seven thousand, eight hundred thirty-seven".