78328276309 has 2 divisors, whose sum is σ = 78328276310. Its totient is φ = 78328276308.

The previous prime is 78328276249. The next prime is 78328276333. The reversal of 78328276309 is 90367282387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49152220209 + 29176056100 = 221703^2 + 170810^2 .

It is a cyclic number.

It is not a de Polignac number, because 78328276309 - 2¹¹ = 78328274261 is a prime.

It is a super-2 number, since 2×78328276309² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78328276309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78328276349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39164138154 + 39164138155.

It is an arithmetic number, because the mean of its divisors is an integer number (39164138155).

Almost surely, 2^78328276309 is an apocalyptic number.

It is an amenable number.

78328276309 is a deficient number, since it is larger than the sum of its proper divisors (1).

78328276309 is an equidigital number, since it uses as much as digits as its factorization.

78328276309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 55.

The spelling of 78328276309 in words is "seventy-eight billion, three hundred twenty-eight million, two hundred seventy-six thousand, three hundred nine".