78115 has 8 divisors (see below), whose sum is σ = 99360. Its totient is φ = 58752.

The previous prime is 78101. The next prime is 78121. The reversal of 78115 is 51187.

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

It is a de Polignac number, because none of the positive numbers 2^k-78115 is a prime.

It is a super-2 number, since 2×78115² = 12203906450, which contains 22 as substring.

It is a nialpdrome in base 5.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375 + ... + 544.

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

78115 is a Friedman number, since it can be written as 5^7-8-1-1, using all its digits and the basic arithmetic operations.

2⁷⁸¹¹⁵ is an apocalyptic number.

78115 is a deficient number, since it is larger than the sum of its proper divisors (21245).

78115 is a wasteful number, since it uses less digits than its factorization.

78115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941.

The product of its digits is 280, while the sum is 22.

The square root of 78115 is about 279.4906080712. The cubic root of 78115 is about 42.7475746147.

The spelling of 78115 in words is "seventy-eight thousand, one hundred fifteen".