428 has 6 divisors (see below), whose sum is σ = 756.
Its totient is φ = 212.
The previous prime is 421. The next prime is 431. The reversal of 428 is 824.
428 is nontrivially palindromic in base 9.
428 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.
428 is an undulating number in base 9.
It is a plaindrome in base 11, base 13, base 14 and base 16.
It is a nialpdrome in base 8.
It is not an unprimeable number, because it can be changed into a prime (421) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50 + ... + 57.
It is an arithmetic number, because the mean of its divisors is an integer number (126).
It is an amenable number.
428 is a deficient number, since it is larger than the sum of its proper divisors (328).
428 is a wasteful number, since it uses less digits than its factorization.
428 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 111 (or 109 counting only the distinct ones).
The product of its digits is 64, while the sum is 14.
The square root of 428 is about 20.6881608656.
The cubic root of 428 is about 7.5361220434.
Subtracting from 428 its sum of digits (14), we obtain a palindrome (414).
It can be divided in two parts, 4 and 28, that added together give a 5-th power (32 = 25).
The spelling of 428 in words is "four hundred twenty-eight", and thus it is an aban number.