77530709 has 2 divisors, whose sum is σ = 77530710. Its totient is φ = 77530708.

The previous prime is 77530703. The next prime is 77530751. The reversal of 77530709 is 90703577.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72624484 + 4906225 = 8522^2 + 2215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77530709 is a prime.

It is a super-2 number, since 2×77530709² = 12022021676085362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77530703) 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, 38765354 + 38765355.

It is an arithmetic number, because the mean of its divisors is an integer number (38765355).

Almost surely, 2^77530709 is an apocalyptic number.

It is an amenable number.

77530709 is a deficient number, since it is larger than the sum of its proper divisors (1).

77530709 is an equidigital number, since it uses as much as digits as its factorization.

77530709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46305, while the sum is 38.

The square root of 77530709 is about 8805.1524120824. The cubic root of 77530709 is about 426.4072548946.

The spelling of 77530709 in words is "seventy-seven million, five hundred thirty thousand, seven hundred nine".