78515 has 8 divisors (see below), whose sum is σ = 96768. Its totient is φ = 61120.

The previous prime is 78511. The next prime is 78517. The reversal of 78515 is 51587.

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

It is not a de Polignac number, because 78515 - 2² = 78511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78511) 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, 14 + ... + 396.

It is an arithmetic number, because the mean of its divisors is an integer number (12096).

2⁷⁸⁵¹⁵ is an apocalyptic number.

78515 is a deficient number, since it is larger than the sum of its proper divisors (18253).

78515 is a wasteful number, since it uses less digits than its factorization.

78515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429.

The product of its digits is 1400, while the sum is 26.

The square root of 78515 is about 280.2052818917. The cubic root of 78515 is about 42.8204156248.

The spelling of 78515 in words is "seventy-eight thousand, five hundred fifteen".