78505 has 8 divisors (see below), whose sum is σ = 107712. Its totient is φ = 53808.

The previous prime is 78497. The next prime is 78509. The reversal of 78505 is 50587.

78505 = 21² + 22² + ... + 62².

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 78505 - 2³ = 78497 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78505.

It is not an unprimeable number, because it can be changed into a prime (78509) 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, 1087 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (13464).

2⁷⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

78505 is a deficient number, since it is larger than the sum of its proper divisors (29207).

78505 is a wasteful number, since it uses less digits than its factorization.

78505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 78505 is about 280.1874372630. The cubic root of 78505 is about 42.8185976184.

The spelling of 78505 in words is "seventy-eight thousand, five hundred five".