428257 has 4 divisors (see below), whose sum is σ = 430276. Its totient is φ = 426240.

The previous prime is 428251. The next prime is 428273. The reversal of 428257 is 752824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271441 + 156816 = 521^2 + 396^2 .

It is a cyclic number.

It is not a de Polignac number, because 428257 - 2³ = 428249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428251) 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, 648 + ... + 1129.

It is an arithmetic number, because the mean of its divisors is an integer number (107569).

2⁴²⁸²⁵⁷ is an apocalyptic number.

It is an amenable number.

428257 is a deficient number, since it is larger than the sum of its proper divisors (2019).

428257 is a wasteful number, since it uses less digits than its factorization.

428257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018.

The product of its digits is 4480, while the sum is 28.

The square root of 428257 is about 654.4134778563. The cubic root of 428257 is about 75.3763013984.

The spelling of 428257 in words is "four hundred twenty-eight thousand, two hundred fifty-seven".