77616549 has 20 divisors (see below), whose sum is σ = 116265996. Its totient is φ = 51601536.

The previous prime is 77616541. The next prime is 77616563. The reversal of 77616549 is 94561677.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48650625 + 28965924 = 6975^2 + 5382^2 .

It is not a de Polignac number, because 77616549 - 2³ = 77616541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77616541) 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 19 ways as a sum of consecutive naturals, for example, 33967 + ... + 36179.

Almost surely, 2^77616549 is an apocalyptic number.

It is an amenable number.

77616549 is a deficient number, since it is larger than the sum of its proper divisors (38649447).

77616549 is a wasteful number, since it uses less digits than its factorization.

77616549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658 (or 2649 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 77616549 is about 8810.0254823695. The cubic root of 77616549 is about 426.5645658878.

The spelling of 77616549 in words is "seventy-seven million, six hundred sixteen thousand, five hundred forty-nine".