684385277 has 2 divisors, whose sum is σ = 684385278. Its totient is φ = 684385276.

The previous prime is 684385271. The next prime is 684385307. The reversal of 684385277 is 772583486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648517156 + 35868121 = 25466^2 + 5989^2 .

It is a cyclic number.

It is not a de Polignac number, because 684385277 - 2⁶ = 684385213 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 (684385271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342192638 + 342192639.

It is an arithmetic number, because the mean of its divisors is an integer number (342192639).

Almost surely, 2^684385277 is an apocalyptic number.

It is an amenable number.

684385277 is a deficient number, since it is larger than the sum of its proper divisors (1).

684385277 is an equidigital number, since it uses as much as digits as its factorization.

684385277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 50.

The square root of 684385277 is about 26160.7583414549. The cubic root of 684385277 is about 881.2522105003.

The spelling of 684385277 in words is "six hundred eighty-four million, three hundred eighty-five thousand, two hundred seventy-seven".