428628 has 24 divisors (see below), whose sum is σ = 1044288. Its totient is φ = 136576.

The previous prime is 428579. The next prime is 428629. The reversal of 428628 is 826824.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 428595 and 428604.

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 428628.

It is not an unprimeable number, because it can be changed into a prime (428629) by changing a digit.

428628 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 7 ways as a sum of consecutive naturals, for example, 501 + ... + 1052.

It is an arithmetic number, because the mean of its divisors is an integer number (43512).

2⁴²⁸⁶²⁸ is an apocalyptic number.

It is an amenable number.

428628 is an abundant number, since it is smaller than the sum of its proper divisors (615660).

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

428628 is a wasteful number, since it uses less digits than its factorization.

428628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583 (or 1581 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 428628 is about 654.6968764245. The cubic root of 428628 is about 75.3980613357.

The spelling of 428628 in words is "four hundred twenty-eight thousand, six hundred twenty-eight".