28987666 has 8 divisors (see below), whose sum is σ = 44884224. Its totient is φ = 14026260.

The previous prime is 28987649. The next prime is 28987681. The reversal of 28987666 is 66678982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233710 + ... + 233833.

It is an arithmetic number, because the mean of its divisors is an integer number (5610528).

Almost surely, 2^28987666 is an apocalyptic number.

28987666 is a deficient number, since it is larger than the sum of its proper divisors (15896558).

28987666 is a wasteful number, since it uses less digits than its factorization.

28987666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467576.

The product of its digits is 1741824, while the sum is 52.

The square root of 28987666 is about 5384.0195021935. The cubic root of 28987666 is about 307.1881201212.

The spelling of 28987666 in words is "twenty-eight million, nine hundred eighty-seven thousand, six hundred sixty-six".