78447 has 8 divisors (see below), whose sum is σ = 106240. Its totient is φ = 51480.

The previous prime is 78439. The next prime is 78467. The reversal of 78447 is 74487.

78447 is nontrivially palindromic in base 12.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78447 - 2³ = 78439 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72 + ... + 402.

It is an arithmetic number, because the mean of its divisors is an integer number (13280).

2⁷⁸⁴⁴⁷ is an apocalyptic number.

78447 is a deficient number, since it is larger than the sum of its proper divisors (27793).

78447 is a wasteful number, since it uses less digits than its factorization.

78447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its digits is 6272, while the sum is 30.

The square root of 78447 is about 280.0839159966. The cubic root of 78447 is about 42.8080501351.

It can be divided in two parts, 78 and 447, that added together give a palindrome (525).

The spelling of 78447 in words is "seventy-eight thousand, four hundred forty-seven".