78928675321 has 2 divisors, whose sum is σ = 78928675322. Its totient is φ = 78928675320.

The previous prime is 78928675313. The next prime is 78928675439. The reversal of 78928675321 is 12357682987.

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., 70585862400 + 8342812921 = 265680^2 + 91339^2 .

It is a cyclic number.

It is not a de Polignac number, because 78928675321 - 2³ = 78928675313 is a prime.

It is not a weakly prime, because it can be changed into another prime (78928675921) 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, 39464337660 + 39464337661.

It is an arithmetic number, because the mean of its divisors is an integer number (39464337661).

Almost surely, 2^78928675321 is an apocalyptic number.

It is an amenable number.

78928675321 is a deficient number, since it is larger than the sum of its proper divisors (1).

78928675321 is an equidigital number, since it uses as much as digits as its factorization.

78928675321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 58.

The spelling of 78928675321 in words is "seventy-eight billion, nine hundred twenty-eight million, six hundred seventy-five thousand, three hundred twenty-one".