77144965 has 4 divisors (see below), whose sum is σ = 92573964. Its totient is φ = 61715968.

The previous prime is 77144941. The next prime is 77144971. The reversal of 77144965 is 56944177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56944177 = 2141 ⋅26597.

It can be written as a sum of positive squares in 2 ways, for example, as 46253601 + 30891364 = 6801^2 + 5558^2 .

It is a cyclic number.

It is not a de Polignac number, because 77144965 - 2¹⁵ = 77112197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7714492 + ... + 7714501.

It is an arithmetic number, because the mean of its divisors is an integer number (23143491).

Almost surely, 2^77144965 is an apocalyptic number.

It is an amenable number.

77144965 is a deficient number, since it is larger than the sum of its proper divisors (15428999).

77144965 is a wasteful number, since it uses less digits than its factorization.

77144965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15428998.

The product of its digits is 211680, while the sum is 43.

The square root of 77144965 is about 8783.2206507636. The cubic root of 77144965 is about 425.6989007966.

The spelling of 77144965 in words is "seventy-seven million, one hundred forty-four thousand, nine hundred sixty-five".