78144877 has 2 divisors, whose sum is σ = 78144878. Its totient is φ = 78144876.

The previous prime is 78144839. The next prime is 78144883. The reversal of 78144877 is 77844187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44342281 + 33802596 = 6659^2 + 5814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78144877 is a prime.

It is a super-2 number, since 2×78144877² = 12213243602690258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78144817) 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, 39072438 + 39072439.

It is an arithmetic number, because the mean of its divisors is an integer number (39072439).

Almost surely, 2^78144877 is an apocalyptic number.

It is an amenable number.

78144877 is a deficient number, since it is larger than the sum of its proper divisors (1).

78144877 is an equidigital number, since it uses as much as digits as its factorization.

78144877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 351232, while the sum is 46.

The square root of 78144877 is about 8839.9591062403. The cubic root of 78144877 is about 427.5302387329.

The spelling of 78144877 in words is "seventy-eight million, one hundred forty-four thousand, eight hundred seventy-seven".