428666 has 16 divisors (see below), whose sum is σ = 747456. Its totient is φ = 180576.

The previous prime is 428663. The next prime is 428671. The reversal of 428666 is 666824.

It is a happy number.

428666 is a modest number, since divided by 666 gives 428 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (46716).

2⁴²⁸⁶⁶⁶ is an apocalyptic number.

428666 is a deficient number, since it is larger than the sum of its proper divisors (318790).

428666 is a wasteful number, since it uses less digits than its factorization.

428666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533.

The product of its digits is 13824, while the sum is 32.

The square root of 428666 is about 654.7258968454. The cubic root of 428666 is about 75.4002894073.

The spelling of 428666 in words is "four hundred twenty-eight thousand, six hundred sixty-six".