78215 has 4 divisors (see below), whose sum is σ = 93864. Its totient is φ = 62568.

The previous prime is 78203. The next prime is 78229. The reversal of 78215 is 51287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78215 - 2¹⁰ = 77191 is a prime.

It is a super-2 number, since 2×78215² = 12235172450, which contains 22 as substring.

It is a d-powerful number, because it can be written as 7² + 8 + 2⁵ + 1 + 5⁷ .

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 78215.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7817 + ... + 7826.

It is an arithmetic number, because the mean of its divisors is an integer number (23466).

2⁷⁸²¹⁵ is an apocalyptic number.

78215 is a deficient number, since it is larger than the sum of its proper divisors (15649).

78215 is a wasteful number, since it uses less digits than its factorization.

78215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15648.

The product of its digits is 560, while the sum is 23.

The square root of 78215 is about 279.6694477414. The cubic root of 78215 is about 42.7658081364.

It can be divided in two parts, 782 and 15, that added together give a palindrome (797).

The spelling of 78215 in words is "seventy-eight thousand, two hundred fifteen".