78534565 has 8 divisors (see below), whose sum is σ = 94930200. Its totient is φ = 62368512.

The previous prime is 78534553. The next prime is 78534569. The reversal of 78534565 is 56543587.

It can be written as a sum of positive squares in 4 ways, for example, as 5841889 + 72692676 = 2417^2 + 8526^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78534565 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78534569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56640 + ... + 58009.

It is an arithmetic number, because the mean of its divisors is an integer number (11866275).

Almost surely, 2^78534565 is an apocalyptic number.

It is an amenable number.

78534565 is a deficient number, since it is larger than the sum of its proper divisors (16395635).

78534565 is a wasteful number, since it uses less digits than its factorization.

78534565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114791.

The product of its digits is 504000, while the sum is 43.

The square root of 78534565 is about 8861.9729744566. The cubic root of 78534565 is about 428.2397210812.

The spelling of 78534565 in words is "seventy-eight million, five hundred thirty-four thousand, five hundred sixty-five".