28871666 has 8 divisors (see below), whose sum is σ = 44017644. Its totient is φ = 14199120.

The previous prime is 28871657. The next prime is 28871669. The reversal of 28871666 is 66617882.

It can be written as a sum of positive squares in 2 ways, for example, as 28847641 + 24025 = 5371^2 + 155^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28871669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118205 + ... + 118448.

Almost surely, 2^28871666 is an apocalyptic number.

28871666 is a deficient number, since it is larger than the sum of its proper divisors (15145978).

28871666 is a wasteful number, since it uses less digits than its factorization.

28871666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236716.

The product of its digits is 193536, while the sum is 44.

The square root of 28871666 is about 5373.2360826601. The cubic root of 28871666 is about 306.7778138911. Note that the first 3 decimals are identical.

The spelling of 28871666 in words is "twenty-eight million, eight hundred seventy-one thousand, six hundred sixty-six".