78355 has 4 divisors (see below), whose sum is σ = 94032. Its totient is φ = 62680.

The previous prime is 78347. The next prime is 78367. The reversal of 78355 is 55387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55387 = 97 ⋅571.

It is not a de Polignac number, because 78355 - 2³ = 78347 is a prime.

It is a super-2 number, since 2×78355² = 12279012050, which contains 22 as substring.

It is a Duffinian number.

78355 is a lucky number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7831 + ... + 7840.

It is an arithmetic number, because the mean of its divisors is an integer number (23508).

2⁷⁸³⁵⁵ is an apocalyptic number.

78355 is a deficient number, since it is larger than the sum of its proper divisors (15677).

78355 is a wasteful number, since it uses less digits than its factorization.

78355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15676.

The product of its digits is 4200, while the sum is 28.

The square root of 78355 is about 279.9196313230. The cubic root of 78355 is about 42.7913089757.

It can be divided in two parts, 783 and 55, that added together give a palindrome (838).

The spelling of 78355 in words is "seventy-eight thousand, three hundred fifty-five".