678120577 has 2 divisors, whose sum is σ = 678120578. Its totient is φ = 678120576.

The previous prime is 678120539. The next prime is 678120589. The reversal of 678120577 is 775021876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341177841 + 336942736 = 18471^2 + 18356^2 .

It is a cyclic number.

It is not a de Polignac number, because 678120577 - 2¹⁹ = 677596289 is a prime.

It is not a weakly prime, because it can be changed into another prime (678120977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339060288 + 339060289.

It is an arithmetic number, because the mean of its divisors is an integer number (339060289).

Almost surely, 2^678120577 is an apocalyptic number.

It is an amenable number.

678120577 is a deficient number, since it is larger than the sum of its proper divisors (1).

678120577 is an equidigital number, since it uses as much as digits as its factorization.

678120577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 43.

The square root of 678120577 is about 26040.7483955435. The cubic root of 678120577 is about 878.5550395717. Note that the first 3 decimals are identical.

The spelling of 678120577 in words is "six hundred seventy-eight million, one hundred twenty thousand, five hundred seventy-seven".