428645 has 16 divisors (see below), whose sum is σ = 605568. Its totient is φ = 285120.

The previous prime is 428639. The next prime is 428657. The reversal of 428645 is 546824.

It is not a de Polignac number, because 428645 - 2⁴ = 428629 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1130 + ... + 1460.

It is an arithmetic number, because the mean of its divisors is an integer number (37848).

2⁴²⁸⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

428645 is a deficient number, since it is larger than the sum of its proper divisors (176923).

428645 is a wasteful number, since it uses less digits than its factorization.

428645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380.

The product of its digits is 7680, while the sum is 29.

The square root of 428645 is about 654.7098594034. The cubic root of 428645 is about 75.3990581209.

The spelling of 428645 in words is "four hundred twenty-eight thousand, six hundred forty-five".