678029057 has 2 divisors, whose sum is σ = 678029058. Its totient is φ = 678029056.

The previous prime is 678028987. The next prime is 678029069. The reversal of 678029057 is 750920876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399840016 + 278189041 = 19996^2 + 16679^2 .

It is a cyclic number.

It is not a de Polignac number, because 678029057 - 2²⁸ = 409593601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678028999 and 678029017.

It is not a weakly prime, because it can be changed into another prime (678029087) 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, 339014528 + 339014529.

It is an arithmetic number, because the mean of its divisors is an integer number (339014529).

Almost surely, 2^678029057 is an apocalyptic number.

It is an amenable number.

678029057 is a deficient number, since it is larger than the sum of its proper divisors (1).

678029057 is an equidigital number, since it uses as much as digits as its factorization.

678029057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 678029057 is about 26038.9910902861. The cubic root of 678029057 is about 878.5155141650.

The spelling of 678029057 in words is "six hundred seventy-eight million, twenty-nine thousand, fifty-seven".