77248609 has 2 divisors, whose sum is σ = 77248610. Its totient is φ = 77248608.

The previous prime is 77248607. The next prime is 77248679. The reversal of 77248609 is 90684277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60109009 + 17139600 = 7753^2 + 4140^2 .

It is an emirp because it is prime and its reverse (90684277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77248609 - 2¹ = 77248607 is a prime.

Together with 77248607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77248607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38624304 + 38624305.

It is an arithmetic number, because the mean of its divisors is an integer number (38624305).

Almost surely, 2^77248609 is an apocalyptic number.

It is an amenable number.

77248609 is a deficient number, since it is larger than the sum of its proper divisors (1).

77248609 is an equidigital number, since it uses as much as digits as its factorization.

77248609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 77248609 is about 8789.1187840420. The cubic root of 77248609 is about 425.8894571634.

The spelling of 77248609 in words is "seventy-seven million, two hundred forty-eight thousand, six hundred nine".