4028666 has 4 divisors (see below), whose sum is σ = 6043002. Its totient is φ = 2014332.

The previous prime is 4028663. The next prime is 4028681. The reversal of 4028666 is 6668204.

It is a happy number.

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., 3916441 + 112225 = 1979^2 + 335^2 .

It is not an unprimeable number, because it can be changed into a prime (4028663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007165 + ... + 1007168.

Almost surely, 2^4028666 is an apocalyptic number.

4028666 is a deficient number, since it is larger than the sum of its proper divisors (2014336).

4028666 is a wasteful number, since it uses less digits than its factorization.

4028666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014335.

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

The square root of 4028666 is about 2007.1537061222. The cubic root of 4028666 is about 159.1184065865.

The spelling of 4028666 in words is "four million, twenty-eight thousand, six hundred sixty-six".