77320449 has 12 divisors (see below), whose sum is σ = 112792212. Its totient is φ = 51036000.

The previous prime is 77320433. The next prime is 77320469. The reversal of 77320449 is 94402377.

It can be written as a sum of positive squares in 2 ways, for example, as 74080449 + 3240000 = 8607^2 + 1800^2 .

It is not a de Polignac number, because 77320449 - 2⁴ = 77320433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77320469) 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 in 11 ways as a sum of consecutive naturals, for example, 41622 + ... + 43439.

It is an arithmetic number, because the mean of its divisors is an integer number (9399351).

Almost surely, 2^77320449 is an apocalyptic number.

It is an amenable number.

77320449 is a deficient number, since it is larger than the sum of its proper divisors (35471763).

77320449 is a wasteful number, since it uses less digits than its factorization.

77320449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85168 (or 85165 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 77320449 is about 8793.2047059079. The cubic root of 77320449 is about 426.0214397726.

The spelling of 77320449 in words is "seventy-seven million, three hundred twenty thousand, four hundred forty-nine".