78565 has 8 divisors (see below), whose sum is σ = 99360. Its totient is φ = 59472.

The previous prime is 78553. The next prime is 78569. The reversal of 78565 is 56587.

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

It is a cyclic number.

It is not a de Polignac number, because 78565 - 2⁷ = 78437 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78569) 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, 319 + ... + 508.

It is an arithmetic number, because the mean of its divisors is an integer number (12420).

2⁷⁸⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

78565 is a deficient number, since it is larger than the sum of its proper divisors (20795).

78565 is a wasteful number, since it uses less digits than its factorization.

78565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its digits is 8400, while the sum is 31.

The square root of 78565 is about 280.2944879943. The cubic root of 78565 is about 42.8295033425.

The spelling of 78565 in words is "seventy-eight thousand, five hundred sixty-five".