78855 has 16 divisors (see below), whose sum is σ = 144384. Its totient is φ = 36000.

The previous prime is 78853. The next prime is 78857. The reversal of 78855 is 55887.

It is an interprime number because it is at equal distance from previous prime (78853) and next prime (78857).

It is not a de Polignac number, because 78855 - 2¹ = 78853 is a prime.

It is a super-2 number, since 2×78855² = 12436222050, which contains 22 as substring.

78855 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78853) 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 15 ways as a sum of consecutive naturals, for example, 271 + ... + 480.

It is an arithmetic number, because the mean of its divisors is an integer number (9024).

2⁷⁸⁸⁵⁵ is an apocalyptic number.

78855 is a deficient number, since it is larger than the sum of its proper divisors (65529).

78855 is a wasteful number, since it uses less digits than its factorization.

78855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766.

The product of its digits is 11200, while the sum is 33.

The square root of 78855 is about 280.8113245580. The cubic root of 78855 is about 42.8821362152.

The spelling of 78855 in words is "seventy-eight thousand, eight hundred fifty-five".