84320028809 has 2 divisors, whose sum is σ = 84320028810. Its totient is φ = 84320028808.

The previous prime is 84320028803. The next prime is 84320028833. The reversal of 84320028809 is 90882002348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69447006784 + 14873022025 = 263528^2 + 121955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84320028809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84320028809.

It is not a weakly prime, because it can be changed into another prime (84320028803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42160014404 + 42160014405.

It is an arithmetic number, because the mean of its divisors is an integer number (42160014405).

Almost surely, 2^84320028809 is an apocalyptic number.

It is an amenable number.

84320028809 is a deficient number, since it is larger than the sum of its proper divisors (1).

84320028809 is an equidigital number, since it uses as much as digits as its factorization.

84320028809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 84320028809 in words is "eighty-four billion, three hundred twenty million, twenty-eight thousand, eight hundred nine".