84428 has 6 divisors (see below), whose sum is σ = 147756. Its totient is φ = 42212.

The previous prime is 84421. The next prime is 84431. The reversal of 84428 is 82448.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 84397 and 84406.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 84428.

It is not an unprimeable number, because it can be changed into a prime (84421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550 + ... + 10557.

It is an arithmetic number, because the mean of its divisors is an integer number (24626).

2⁸⁴⁴²⁸ is an apocalyptic number.

It is an amenable number.

84428 is a deficient number, since it is larger than the sum of its proper divisors (63328).

84428 is a wasteful number, since it uses less digits than its factorization.

84428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21111 (or 21109 counting only the distinct ones).

The product of its digits is 2048, while the sum is 26.

The square root of 84428 is about 290.5649669179. The cubic root of 84428 is about 43.8694477326.

It can be divided in two parts, 844 and 28, that multiplied together give a palindrome (23632).

The spelling of 84428 in words is "eighty-four thousand, four hundred twenty-eight".