78726811 has 2 divisors, whose sum is σ = 78726812. Its totient is φ = 78726810.

The previous prime is 78726803. The next prime is 78726821. The reversal of 78726811 is 11862787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78726811 - 2³ = 78726803 is a prime.

It is not a weakly prime, because it can be changed into another prime (78726821) 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, 39363405 + 39363406.

It is an arithmetic number, because the mean of its divisors is an integer number (39363406).

Almost surely, 2^78726811 is an apocalyptic number.

78726811 is a deficient number, since it is larger than the sum of its proper divisors (1).

78726811 is an equidigital number, since it uses as much as digits as its factorization.

78726811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 40.

The square root of 78726811 is about 8872.8130263181. The cubic root of 78726811 is about 428.5888679306.

The spelling of 78726811 in words is "seventy-eight million, seven hundred twenty-six thousand, eight hundred eleven".