78055811 has 2 divisors, whose sum is σ = 78055812. Its totient is φ = 78055810.

The previous prime is 78055801. The next prime is 78055837. The reversal of 78055811 is 11855087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78055811 - 2²² = 73861507 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (78055801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39027905 + 39027906.

It is an arithmetic number, because the mean of its divisors is an integer number (39027906).

Almost surely, 2^78055811 is an apocalyptic number.

78055811 is a deficient number, since it is larger than the sum of its proper divisors (1).

78055811 is an equidigital number, since it uses as much as digits as its factorization.

78055811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 78055811 is about 8834.9199770004. The cubic root of 78055811 is about 427.3677504353.

The spelling of 78055811 in words is "seventy-eight million, fifty-five thousand, eight hundred eleven".