78434 has 4 divisors (see below), whose sum is σ = 117654. Its totient is φ = 39216.

The previous prime is 78427. The next prime is 78437. The reversal of 78434 is 43487.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75625 + 2809 = 275^2 + 53^2 .

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (78437) 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, 19607 + ... + 19610.

2⁷⁸⁴³⁴ is an apocalyptic number.

78434 is a deficient number, since it is larger than the sum of its proper divisors (39220).

78434 is a wasteful number, since it uses less digits than its factorization.

78434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39219.

The product of its digits is 2688, while the sum is 26.

The square root of 78434 is about 280.0607077046. The cubic root of 78434 is about 42.8056853309.

It can be divided in two parts, 784 and 34, that added together give a palindrome (818).

The spelling of 78434 in words is "seventy-eight thousand, four hundred thirty-four".