78784 has 14 divisors (see below), whose sum is σ = 156464. Its totient is φ = 39360.

The previous prime is 78781. The next prime is 78787. The reversal of 78784 is 48787.

It is an interprime number because it is at equal distance from previous prime (78781) and next prime (78787).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78781) 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 as a sum of consecutive naturals, namely, 552 + ... + 679.

It is an arithmetic number, because the mean of its divisors is an integer number (11176).

2⁷⁸⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

78784 is a deficient number, since it is larger than the sum of its proper divisors (77680).

78784 is a wasteful number, since it uses less digits than its factorization.

78784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243 (or 1233 counting only the distinct ones).

The product of its digits is 12544, while the sum is 34.

The square root of 78784 is about 280.6848766856. The cubic root of 78784 is about 42.8692621810.

The spelling of 78784 in words is "seventy-eight thousand, seven hundred eighty-four".