78555 has 8 divisors (see below), whose sum is σ = 125712. Its totient is φ = 41888.

The previous prime is 78553. The next prime is 78569. The reversal of 78555 is 55587.

It is a happy number.

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 78555 - 2¹ = 78553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78553) 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, 2604 + ... + 2633.

It is an arithmetic number, because the mean of its divisors is an integer number (15714).

2⁷⁸⁵⁵⁵ is an apocalyptic number.

78555 is a deficient number, since it is larger than the sum of its proper divisors (47157).

78555 is a wasteful number, since it uses less digits than its factorization.

78555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5245.

The product of its digits is 7000, while the sum is 30.

The square root of 78555 is about 280.2766490452. The cubic root of 78555 is about 42.8276861075.

The spelling of 78555 in words is "seventy-eight thousand, five hundred fifty-five".