77345565 has 16 divisors (see below), whose sum is σ = 135003456. Its totient is φ = 37500800.

The previous prime is 77345551. The next prime is 77345623. The reversal of 77345565 is 56554377.

It is not a de Polignac number, because 77345565 - 2⁵ = 77345533 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234216 + ... + 234545.

It is an arithmetic number, because the mean of its divisors is an integer number (8437716).

Almost surely, 2^77345565 is an apocalyptic number.

It is an amenable number.

77345565 is a deficient number, since it is larger than the sum of its proper divisors (57657891).

77345565 is a wasteful number, since it uses less digits than its factorization.

77345565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468780.

The product of its digits is 441000, while the sum is 42.

The square root of 77345565 is about 8794.6327382103. The cubic root of 77345565 is about 426.0675629577.

The spelling of 77345565 in words is "seventy-seven million, three hundred forty-five thousand, five hundred sixty-five".