77912449 has 2 divisors, whose sum is σ = 77912450. Its totient is φ = 77912448.

The previous prime is 77912321. The next prime is 77912467. The reversal of 77912449 is 94421977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68178049 + 9734400 = 8257^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 77912449 - 2⁷ = 77912321 is a prime.

It is not a weakly prime, because it can be changed into another prime (77913449) 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 as a sum of consecutive naturals, namely, 38956224 + 38956225.

It is an arithmetic number, because the mean of its divisors is an integer number (38956225).

Almost surely, 2^77912449 is an apocalyptic number.

It is an amenable number.

77912449 is a deficient number, since it is larger than the sum of its proper divisors (1).

77912449 is an equidigital number, since it uses as much as digits as its factorization.

77912449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 77912449 is about 8826.8028753337. The cubic root of 77912449 is about 427.1059469784.

The spelling of 77912449 in words is "seventy-seven million, nine hundred twelve thousand, four hundred forty-nine".