78405311 has 2 divisors, whose sum is σ = 78405312. Its totient is φ = 78405310.

The previous prime is 78405289. The next prime is 78405319. The reversal of 78405311 is 11350487.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78405311 is a prime.

It is a super-2 number, since 2×78405311² = 12294785586013442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78405319) 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, 39202655 + 39202656.

It is an arithmetic number, because the mean of its divisors is an integer number (39202656).

Almost surely, 2^78405311 is an apocalyptic number.

78405311 is a deficient number, since it is larger than the sum of its proper divisors (1).

78405311 is an equidigital number, since it uses as much as digits as its factorization.

78405311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 78405311 is about 8854.6773515470. The cubic root of 78405311 is about 428.0046564696.

Adding to 78405311 its reverse (11350487), we get a palindrome (89755798).

The spelling of 78405311 in words is "seventy-eight million, four hundred five thousand, three hundred eleven".