77970811 has 2 divisors, whose sum is σ = 77970812. Its totient is φ = 77970810.

The previous prime is 77970773. The next prime is 77970817. The reversal of 77970811 is 11807977.

It is a strong prime.

It is an emirp because it is prime and its reverse (11807977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77970811 - 2¹¹ = 77968763 is a prime.

It is not a weakly prime, because it can be changed into another prime (77970817) 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, 38985405 + 38985406.

It is an arithmetic number, because the mean of its divisors is an integer number (38985406).

Almost surely, 2^77970811 is an apocalyptic number.

77970811 is a deficient number, since it is larger than the sum of its proper divisors (1).

77970811 is an equidigital number, since it uses as much as digits as its factorization.

77970811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24696, while the sum is 40.

The square root of 77970811 is about 8830.1082099825. The cubic root of 77970811 is about 427.2125646679.

The spelling of 77970811 in words is "seventy-seven million, nine hundred seventy thousand, eight hundred eleven".