690778367 has 2 divisors, whose sum is σ = 690778368. Its totient is φ = 690778366.

The previous prime is 690778351. The next prime is 690778381. The reversal of 690778367 is 763877096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690778367 - 2⁴ = 690778351 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 (690778267) 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, 345389183 + 345389184.

It is an arithmetic number, because the mean of its divisors is an integer number (345389184).

Almost surely, 2^690778367 is an apocalyptic number.

690778367 is a deficient number, since it is larger than the sum of its proper divisors (1).

690778367 is an equidigital number, since it uses as much as digits as its factorization.

690778367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 53.

The square root of 690778367 is about 26282.6628597637. The cubic root of 690778367 is about 883.9877419422.

The spelling of 690778367 in words is "six hundred ninety million, seven hundred seventy-eight thousand, three hundred sixty-seven".