306728326057 has 2 divisors, whose sum is σ = 306728326058. Its totient is φ = 306728326056.

The previous prime is 306728326007. The next prime is 306728326133. The reversal of 306728326057 is 750623827603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238179137296 + 68549188761 = 488036^2 + 261819^2 .

It is a cyclic number.

It is not a de Polignac number, because 306728326057 - 2⁷ = 306728325929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 306728326057.

It is not a weakly prime, because it can be changed into another prime (306728326007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153364163028 + 153364163029.

It is an arithmetic number, because the mean of its divisors is an integer number (153364163029).

Almost surely, 2^306728326057 is an apocalyptic number.

It is an amenable number.

306728326057 is a deficient number, since it is larger than the sum of its proper divisors (1).

306728326057 is an equidigital number, since it uses as much as digits as its factorization.

306728326057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 306728326057 in words is "three hundred six billion, seven hundred twenty-eight million, three hundred twenty-six thousand, fifty-seven".