66428 has 6 divisors (see below), whose sum is σ = 116256. Its totient is φ = 33212.

The previous prime is 66413. The next prime is 66431. The reversal of 66428 is 82466.

It is a d-powerful number, because it can be written as 6² + 6³ + 4⁸ + 2⁷ + 8³ .

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 66397 and 66406.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66428.

It is an unprimeable number.

66428 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 as a sum of consecutive naturals, namely, 8300 + ... + 8307.

It is an arithmetic number, because the mean of its divisors is an integer number (19376).

2⁶⁶⁴²⁸ is an apocalyptic number.

It is an amenable number.

66428 is a deficient number, since it is larger than the sum of its proper divisors (49828).

66428 is a wasteful number, since it uses less digits than its factorization.

66428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16611 (or 16609 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 66428 is about 257.7362993449. The cubic root of 66428 is about 40.4995681507.

It can be divided in two parts, 66 and 428, that added together give a palindrome (494).

The spelling of 66428 in words is "sixty-six thousand, four hundred twenty-eight".