77644465 has 4 divisors (see below), whose sum is σ = 93173364. Its totient is φ = 62115568.

The previous prime is 77644459. The next prime is 77644477. The reversal of 77644465 is 56444677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56444677 = 1277 ⋅44201.

It can be written as a sum of positive squares in 2 ways, for example, as 33965584 + 43678881 = 5828^2 + 6609^2 .

It is a cyclic number.

It is not a de Polignac number, because 77644465 - 2⁷ = 77644337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7764442 + ... + 7764451.

It is an arithmetic number, because the mean of its divisors is an integer number (23293341).

Almost surely, 2^77644465 is an apocalyptic number.

It is an amenable number.

77644465 is a deficient number, since it is larger than the sum of its proper divisors (15528899).

77644465 is a wasteful number, since it uses less digits than its factorization.

77644465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15528898.

The product of its digits is 564480, while the sum is 43.

The square root of 77644465 is about 8811.6096713370. The cubic root of 77644465 is about 426.6156999532.

The spelling of 77644465 in words is "seventy-seven million, six hundred forty-four thousand, four hundred sixty-five".