77248709 has 2 divisors, whose sum is σ = 77248710. Its totient is φ = 77248708.

The previous prime is 77248687. The next prime is 77248727. The reversal of 77248709 is 90784277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61622500 + 15626209 = 7850^2 + 3953^2 .

It is a cyclic number.

It is not a de Polignac number, because 77248709 - 2²⁰ = 76200133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77248709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77248609) 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, 38624354 + 38624355.

It is an arithmetic number, because the mean of its divisors is an integer number (38624355).

Almost surely, 2^77248709 is an apocalyptic number.

It is an amenable number.

77248709 is a deficient number, since it is larger than the sum of its proper divisors (1).

77248709 is an equidigital number, since it uses as much as digits as its factorization.

77248709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 77248709 is about 8789.1244728926. The cubic root of 77248709 is about 425.8896409377.

The spelling of 77248709 in words is "seventy-seven million, two hundred forty-eight thousand, seven hundred nine".