77755427 has 2 divisors, whose sum is σ = 77755428. Its totient is φ = 77755426.

The previous prime is 77755411. The next prime is 77755441. The reversal of 77755427 is 72455777.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77755427 - 2⁴ = 77755411 is a prime.

It is not a weakly prime, because it can be changed into another prime (77755927) 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, 38877713 + 38877714.

It is an arithmetic number, because the mean of its divisors is an integer number (38877714).

Almost surely, 2^77755427 is an apocalyptic number.

77755427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77755427 is an equidigital number, since it uses as much as digits as its factorization.

77755427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480200, while the sum is 44.

The square root of 77755427 is about 8817.9037758415. The cubic root of 77755427 is about 426.8188292590.

The spelling of 77755427 in words is "seventy-seven million, seven hundred fifty-five thousand, four hundred twenty-seven".