428581 has 4 divisors (see below), whose sum is σ = 438592. Its totient is φ = 418572.

The previous prime is 428579. The next prime is 428629. The reversal of 428581 is 185824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428581 - 2¹ = 428579 is a prime.

It is a super-2 number, since 2×428581² = 367363347122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4941 + ... + 5026.

It is an arithmetic number, because the mean of its divisors is an integer number (109648).

2⁴²⁸⁵⁸¹ is an apocalyptic number.

It is an amenable number.

428581 is a deficient number, since it is larger than the sum of its proper divisors (10011).

428581 is an equidigital number, since it uses as much as digits as its factorization.

428581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010.

The product of its digits is 2560, while the sum is 28.

The square root of 428581 is about 654.6609809665. The cubic root of 428581 is about 75.3953053807.

The spelling of 428581 in words is "four hundred twenty-eight thousand, five hundred eighty-one".