78831 has 12 divisors (see below), whose sum is σ = 120120. Its totient is φ = 49680.

The previous prime is 78823. The next prime is 78839. The reversal of 78831 is 13887.

It is an interprime number because it is at equal distance from previous prime (78823) and next prime (78839).

It is not a de Polignac number, because 78831 - 2³ = 78823 is a prime.

It is a super-2 number, since 2×78831² = 12428653122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 78795 and 78804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60 + ... + 401.

It is an arithmetic number, because the mean of its divisors is an integer number (10010).

2⁷⁸⁸³¹ is an apocalyptic number.

78831 is a deficient number, since it is larger than the sum of its proper divisors (41289).

78831 is a wasteful number, since it uses less digits than its factorization.

78831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 483 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 78831 is about 280.7685879866. The cubic root of 78831 is about 42.8777852939.

It can be divided in two parts, 78 and 831, that added together give a palindrome (909).

The spelling of 78831 in words is "seventy-eight thousand, eight hundred thirty-one".