77947427 has 2 divisors, whose sum is σ = 77947428. Its totient is φ = 77947426.

The previous prime is 77947403. The next prime is 77947451. The reversal of 77947427 is 72474977.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (77947403) and next prime (77947451).

It is an emirp because it is prime and its reverse (72474977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77947427 - 2⁸ = 77947171 is a prime.

It is not a weakly prime, because it can be changed into another prime (77947477) 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, 38973713 + 38973714.

It is an arithmetic number, because the mean of its divisors is an integer number (38973714).

Almost surely, 2^77947427 is an apocalyptic number.

77947427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77947427 is an equidigital number, since it uses as much as digits as its factorization.

77947427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691488, while the sum is 47.

The square root of 77947427 is about 8828.7840046067. The cubic root of 77947427 is about 427.1698523703.

The spelling of 77947427 in words is "seventy-seven million, nine hundred forty-seven thousand, four hundred twenty-seven".