77544449 has 2 divisors, whose sum is σ = 77544450. Its totient is φ = 77544448.

The previous prime is 77544443. The next prime is 77544457. The reversal of 77544449 is 94444577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51940849 + 25603600 = 7207^2 + 5060^2 .

It is an emirp because it is prime and its reverse (94444577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77544449 - 2⁴ = 77544433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77544443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38772224 + 38772225.

It is an arithmetic number, because the mean of its divisors is an integer number (38772225).

Almost surely, 2^77544449 is an apocalyptic number.

It is an amenable number.

77544449 is a deficient number, since it is larger than the sum of its proper divisors (1).

77544449 is an equidigital number, since it uses as much as digits as its factorization.

77544449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 44.

The square root of 77544449 is about 8805.9326025129. The cubic root of 77544449 is about 426.4324427189.

The spelling of 77544449 in words is "seventy-seven million, five hundred forty-four thousand, four hundred forty-nine".