78915 has 8 divisors (see below), whose sum is σ = 126288. Its totient is φ = 42080.

The previous prime is 78901. The next prime is 78919. The reversal of 78915 is 51987.

78915 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

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

It is not a de Polignac number, because 78915 - 2⁷ = 78787 is a prime.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (78919) by changing a digit.

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, 2616 + ... + 2645.

It is an arithmetic number, because the mean of its divisors is an integer number (15786).

2⁷⁸⁹¹⁵ is an apocalyptic number.

78915 is a deficient number, since it is larger than the sum of its proper divisors (47373).

78915 is a wasteful number, since it uses less digits than its factorization.

78915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5269.

The product of its digits is 2520, while the sum is 30.

The square root of 78915 is about 280.9181375419. The cubic root of 78915 is about 42.8930096575.

The spelling of 78915 in words is "seventy-eight thousand, nine hundred fifteen".