77865265 has 4 divisors (see below), whose sum is σ = 93438324. Its totient is φ = 62292208.

The previous prime is 77865257. The next prime is 77865269. The reversal of 77865265 is 56256877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56256877 = 1051 ⋅53527.

It can be written as a sum of positive squares in 2 ways, for example, as 54863649 + 23001616 = 7407^2 + 4796^2 .

It is a cyclic number.

It is not a de Polignac number, because 77865265 - 2³ = 77865257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77865269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7786522 + ... + 7786531.

It is an arithmetic number, because the mean of its divisors is an integer number (23359581).

Almost surely, 2^77865265 is an apocalyptic number.

It is an amenable number.

77865265 is a deficient number, since it is larger than the sum of its proper divisors (15573059).

77865265 is a wasteful number, since it uses less digits than its factorization.

77865265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15573058.

The product of its digits is 705600, while the sum is 46.

The square root of 77865265 is about 8824.1297021293. The cubic root of 77865265 is about 427.0197107103.

The spelling of 77865265 in words is "seventy-seven million, eight hundred sixty-five thousand, two hundred sixty-five".