678613073 has 2 divisors, whose sum is σ = 678613074. Its totient is φ = 678613072.

The previous prime is 678613069. The next prime is 678613093. The reversal of 678613073 is 370316876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 674544784 + 4068289 = 25972^2 + 2017^2 .

It is a cyclic number.

It is not a de Polignac number, because 678613073 - 2² = 678613069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 678613073.

It is not a weakly prime, because it can be changed into another prime (678613043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339306536 + 339306537.

It is an arithmetic number, because the mean of its divisors is an integer number (339306537).

Almost surely, 2^678613073 is an apocalyptic number.

It is an amenable number.

678613073 is a deficient number, since it is larger than the sum of its proper divisors (1).

678613073 is an equidigital number, since it uses as much as digits as its factorization.

678613073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 678613073 is about 26050.2029358698. The cubic root of 678613073 is about 878.7676763561.

The spelling of 678613073 in words is "six hundred seventy-eight million, six hundred thirteen thousand, seventy-three".