678034321 has 2 divisors, whose sum is σ = 678034322. Its totient is φ = 678034320.

The previous prime is 678034289. The next prime is 678034373. The reversal of 678034321 is 123430876.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663783696 + 14250625 = 25764^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 678034321 - 2⁵ = 678034289 is a prime.

It is not a weakly prime, because it can be changed into another prime (678034381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339017160 + 339017161.

It is an arithmetic number, because the mean of its divisors is an integer number (339017161).

Almost surely, 2^678034321 is an apocalyptic number.

It is an amenable number.

678034321 is a deficient number, since it is larger than the sum of its proper divisors (1).

678034321 is an equidigital number, since it uses as much as digits as its factorization.

678034321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 678034321 is about 26039.0921692750. The cubic root of 678034321 is about 878.5177876633.

The spelling of 678034321 in words is "six hundred seventy-eight million, thirty-four thousand, three hundred twenty-one".