78144071 has 2 divisors, whose sum is σ = 78144072. Its totient is φ = 78144070.

The previous prime is 78143999. The next prime is 78144083. The reversal of 78144071 is 17044187.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78144071 is a prime.

It is a super-2 number, since 2×78144071² = 12212991664906082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78140071) 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, 39072035 + 39072036.

It is an arithmetic number, because the mean of its divisors is an integer number (39072036).

Almost surely, 2^78144071 is an apocalyptic number.

78144071 is a deficient number, since it is larger than the sum of its proper divisors (1).

78144071 is an equidigital number, since it uses as much as digits as its factorization.

78144071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 78144071 is about 8839.9135176765. The cubic root of 78144071 is about 427.5287688538.

The spelling of 78144071 in words is "seventy-eight million, one hundred forty-four thousand, seventy-one".