78505365 has 32 divisors (see below), whose sum is σ = 129983616. Its totient is φ = 40432640.

The previous prime is 78505363. The next prime is 78505391. The reversal of 78505365 is 56350587.

It is not a de Polignac number, because 78505365 - 2¹ = 78505363 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78505363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65209 + ... + 66401.

It is an arithmetic number, because the mean of its divisors is an integer number (4061988).

Almost surely, 2^78505365 is an apocalyptic number.

It is an amenable number.

78505365 is a deficient number, since it is larger than the sum of its proper divisors (51478251).

78505365 is a wasteful number, since it uses less digits than its factorization.

78505365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349.

The product of its (nonzero) digits is 126000, while the sum is 39.

The square root of 78505365 is about 8860.3253326275. The cubic root of 78505365 is about 428.1866397832.

The spelling of 78505365 in words is "seventy-eight million, five hundred five thousand, three hundred sixty-five".