778888973 has 2 divisors, whose sum is σ = 778888974. Its totient is φ = 778888972.

The previous prime is 778888937. The next prime is 778888993. The reversal of 778888973 is 379888877.

Together with previous prime (778888937) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665743204 + 113145769 = 25802^2 + 10637^2 .

It is a cyclic number.

It is not a de Polignac number, because 778888973 - 2⁶ = 778888909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778888933) 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, 389444486 + 389444487.

It is an arithmetic number, because the mean of its divisors is an integer number (389444487).

Almost surely, 2^778888973 is an apocalyptic number.

It is an amenable number.

778888973 is a deficient number, since it is larger than the sum of its proper divisors (1).

778888973 is an equidigital number, since it uses as much as digits as its factorization.

778888973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37933056, while the sum is 65.

The square root of 778888973 is about 27908.5824254834. The cubic root of 778888973 is about 920.0791413487.

The spelling of 778888973 in words is "seven hundred seventy-eight million, eight hundred eighty-eight thousand, nine hundred seventy-three".