678021713 has 2 divisors, whose sum is σ = 678021714. Its totient is φ = 678021712.

The previous prime is 678021697. The next prime is 678021733. The reversal of 678021713 is 317120876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531901969 + 146119744 = 23063^2 + 12088^2 .

It is a cyclic number.

It is not a de Polignac number, because 678021713 - 2⁴ = 678021697 is a prime.

It is not a weakly prime, because it can be changed into another prime (678021733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339010856 + 339010857.

It is an arithmetic number, because the mean of its divisors is an integer number (339010857).

Almost surely, 2^678021713 is an apocalyptic number.

It is an amenable number.

678021713 is a deficient number, since it is larger than the sum of its proper divisors (1).

678021713 is an equidigital number, since it uses as much as digits as its factorization.

678021713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 678021713 is about 26038.8500706156. The cubic root of 678021713 is about 878.5123423043.

The spelling of 678021713 in words is "six hundred seventy-eight million, twenty-one thousand, seven hundred thirteen".