78715 has 16 divisors (see below), whose sum is σ = 116928. Its totient is φ = 49536.

The previous prime is 78713. The next prime is 78721. The reversal of 78715 is 51787.

78715 = T₁₃ + T₁₄ + ... + T₇₇.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78715 - 2¹ = 78713 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369 + ... + 541.

It is an arithmetic number, because the mean of its divisors is an integer number (7308).

2⁷⁸⁷¹⁵ is an apocalyptic number.

78715 is a deficient number, since it is larger than the sum of its proper divisors (38213).

78715 is a wasteful number, since it uses less digits than its factorization.

78715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198.

The product of its digits is 1960, while the sum is 28.

The square root of 78715 is about 280.5619361211. The cubic root of 78715 is about 42.8567433825.

Subtracting from 78715 its sum of digits (28), we obtain a palindrome (78687).

The spelling of 78715 in words is "seventy-eight thousand, seven hundred fifteen".