428066 has 4 divisors (see below), whose sum is σ = 642102. Its totient is φ = 214032.

The previous prime is 428047. The next prime is 428083. The reversal of 428066 is 660824.

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

It can be written as a sum of positive squares in only one way, i.e., 279841 + 148225 = 529^2 + 385^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428066.

It is an unprimeable number.

428066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107015 + ... + 107018.

2⁴²⁸⁰⁶⁶ is an apocalyptic number.

428066 is a deficient number, since it is larger than the sum of its proper divisors (214036).

428066 is a wasteful number, since it uses less digits than its factorization.

428066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214035.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 428066 is about 654.2675293792. The cubic root of 428066 is about 75.3650939424.

The spelling of 428066 in words is "four hundred twenty-eight thousand, sixty-six".