3281666 has 4 divisors (see below), whose sum is σ = 4922502. Its totient is φ = 1640832.

The previous prime is 3281657. The next prime is 3281687. The reversal of 3281666 is 6661823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6661823 = 7 ⋅951689.

It can be written as a sum of positive squares in only one way, i.e., 3010225 + 271441 = 1735^2 + 521^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820415 + ... + 820418.

Almost surely, 2^3281666 is an apocalyptic number.

3281666 is a deficient number, since it is larger than the sum of its proper divisors (1640836).

3281666 is a wasteful number, since it uses less digits than its factorization.

3281666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640835.

The product of its digits is 10368, while the sum is 32.

The square root of 3281666 is about 1811.5369165435. The cubic root of 3281666 is about 148.6043283544.

The spelling of 3281666 in words is "three million, two hundred eighty-one thousand, six hundred sixty-six".