428566 has 4 divisors (see below), whose sum is σ = 642852. Its totient is φ = 214282.

The previous prime is 428563. The next prime is 428567. The reversal of 428566 is 665824.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107140 + ... + 107143.

It is an arithmetic number, because the mean of its divisors is an integer number (160713).

2⁴²⁸⁵⁶⁶ is an apocalyptic number.

428566 is a deficient number, since it is larger than the sum of its proper divisors (214286).

428566 is a wasteful number, since it uses less digits than its factorization.

428566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214285.

The product of its digits is 11520, while the sum is 31.

The square root of 428566 is about 654.6495245549. The cubic root of 428566 is about 75.3944257782.

The spelling of 428566 in words is "four hundred twenty-eight thousand, five hundred sixty-six".