78444 has 18 divisors (see below), whose sum is σ = 198380. Its totient is φ = 26136.

The previous prime is 78439. The next prime is 78467. The reversal of 78444 is 44487.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×78444² = 12306922272, which contains 22 as substring.

It is an unprimeable number.

78444 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, 1054 + ... + 1125.

2⁷⁸⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

78444 is an abundant number, since it is smaller than the sum of its proper divisors (119936).

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

78444 is a wasteful number, since it uses less digits than its factorization.

78444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189 (or 2184 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 78444 is about 280.0785604076. The cubic root of 78444 is about 42.8075044343.

Adding to 78444 its product of digits (3584), we get a palindrome (82028).

It can be divided in two parts, 784 and 44, that added together give a palindrome (828).

The spelling of 78444 in words is "seventy-eight thousand, four hundred forty-four".