428287 has 4 divisors (see below), whose sum is σ = 429840. Its totient is φ = 426736.

The previous prime is 428273. The next prime is 428297. The reversal of 428287 is 782824.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428287 is a prime.

It is a Smith number, since the sum of its digits (31) 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 plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428227) 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, 238 + ... + 955.

It is an arithmetic number, because the mean of its divisors is an integer number (107460).

2⁴²⁸²⁸⁷ is an apocalyptic number.

428287 is a deficient number, since it is larger than the sum of its proper divisors (1553).

428287 is a wasteful number, since it uses less digits than its factorization.

428287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552.

The product of its digits is 7168, while the sum is 31.

The square root of 428287 is about 654.4363987432. The cubic root of 428287 is about 75.3780614290.

The spelling of 428287 in words is "four hundred twenty-eight thousand, two hundred eighty-seven".