2978666 has 16 divisors (see below), whose sum is σ = 4665600. Its totient is φ = 1424640.

The previous prime is 2978629. The next prime is 2978681. The reversal of 2978666 is 6668792.

It is a super-2 number, since 2×2978666² = 17744902279112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6410 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (291600).

2^2978666 is an apocalyptic number.

2978666 is a deficient number, since it is larger than the sum of its proper divisors (1686934).

2978666 is a wasteful number, since it uses less digits than its factorization.

2978666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589.

The product of its digits is 217728, while the sum is 44.

The square root of 2978666 is about 1725.8812241866. The cubic root of 2978666 is about 143.8822661646.

The spelling of 2978666 in words is "two million, nine hundred seventy-eight thousand, six hundred sixty-six".