84778663 has 2 divisors, whose sum is σ = 84778664. Its totient is φ = 84778662.

The previous prime is 84778657. The next prime is 84778691. The reversal of 84778663 is 36687748.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84778663 - 2⁹ = 84778151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84778963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42389331 + 42389332.

It is an arithmetic number, because the mean of its divisors is an integer number (42389332).

Almost surely, 2^84778663 is an apocalyptic number.

84778663 is a deficient number, since it is larger than the sum of its proper divisors (1).

84778663 is an equidigital number, since it uses as much as digits as its factorization.

84778663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 49.

The square root of 84778663 is about 9207.5329486242. The cubic root of 84778663 is about 439.3009958342.

The spelling of 84778663 in words is "eighty-four million, seven hundred seventy-eight thousand, six hundred sixty-three".