77748469 has 2 divisors, whose sum is σ = 77748470. Its totient is φ = 77748468.

The previous prime is 77748467. The next prime is 77748491. The reversal of 77748469 is 96484777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41447844 + 36300625 = 6438^2 + 6025^2 .

It is an emirp because it is prime and its reverse (96484777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77748469 - 2¹ = 77748467 is a prime.

It is a super-2 number, since 2×77748469² = 12089648863687922, which contains 22 as substring.

Together with 77748467, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77748467) 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, 38874234 + 38874235.

It is an arithmetic number, because the mean of its divisors is an integer number (38874235).

Almost surely, 2^77748469 is an apocalyptic number.

It is an amenable number.

77748469 is a deficient number, since it is larger than the sum of its proper divisors (1).

77748469 is an equidigital number, since it uses as much as digits as its factorization.

77748469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 52.

The square root of 77748469 is about 8817.5092288015. The cubic root of 77748469 is about 426.8060974831.

The spelling of 77748469 in words is "seventy-seven million, seven hundred forty-eight thousand, four hundred sixty-nine".