2666728 has 8 divisors (see below), whose sum is σ = 5000130. Its totient is φ = 1333360.

The previous prime is 2666717. The next prime is 2666743. The reversal of 2666728 is 8276662.

It can be written as a sum of positive squares in only one way, i.e., 2304324 + 362404 = 1518^2 + 602^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×2666728² = 14222876451968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166663 + ... + 166678.

2^2666728 is an apocalyptic number.

It is an amenable number.

2666728 is a deficient number, since it is larger than the sum of its proper divisors (2333402).

2666728 is a wasteful number, since it uses less digits than its factorization.

2666728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333347 (or 333343 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 2666728 is about 1633.0119411688. The cubic root of 2666728 is about 138.6733180159.

The spelling of 2666728 in words is "two million, six hundred sixty-six thousand, seven hundred twenty-eight".