78426 has 12 divisors (see below), whose sum is σ = 169962. Its totient is φ = 26136.

The previous prime is 78401. The next prime is 78427. The reversal of 78426 is 62487.

78426 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in only one way, i.e., 40401 + 38025 = 201^2 + 195^2 .

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 self number, because there is not a number n which added to its sum of digits gives 78426.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 78426.

It is not an unprimeable number, because it can be changed into a prime (78427) by changing a digit.

78426 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2161 + ... + 2196.

2⁷⁸⁴²⁶ is an apocalyptic number.

78426 is an abundant number, since it is smaller than the sum of its proper divisors (91536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78426 is a wasteful number, since it uses less digits than its factorization.

78426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365 (or 4362 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 78426 is about 280.0464247228. The cubic root of 78426 is about 42.8042299368.

The spelling of 78426 in words is "seventy-eight thousand, four hundred twenty-six".