428445 has 12 divisors (see below), whose sum is σ = 742716. Its totient is φ = 228480.

The previous prime is 428429. The next prime is 428471. The reversal of 428445 is 544824.

It can be written as a sum of positive squares in 2 ways, for example, as 171396 + 257049 = 414^2 + 507^2 .

It is not a de Polignac number, because 428445 - 2⁴ = 428429 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4716 + ... + 4805.

It is an arithmetic number, because the mean of its divisors is an integer number (61893).

2⁴²⁸⁴⁴⁵ is an apocalyptic number.

428445 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

428445 is a deficient number, since it is larger than the sum of its proper divisors (314271).

428445 is a wasteful number, since it uses less digits than its factorization.

428445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9532 (or 9529 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 428445 is about 654.5571021691. The cubic root of 428445 is about 75.3873295673.

It can be divided in two parts, 42844 and 5, that added together give a square (42849 = 207²).

The spelling of 428445 in words is "four hundred twenty-eight thousand, four hundred forty-five".