28871665 has 8 divisors (see below), whose sum is σ = 34691328. Its totient is φ = 23067120.

The previous prime is 28871657. The next prime is 28871669. The reversal of 28871665 is 56617882.

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

It is not a de Polignac number, because 28871665 - 2³ = 28871657 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 970 + ... + 7660.

It is an arithmetic number, because the mean of its divisors is an integer number (4336416).

Almost surely, 2^28871665 is an apocalyptic number.

It is an amenable number.

28871665 is a deficient number, since it is larger than the sum of its proper divisors (5819663).

28871665 is an equidigital number, since it uses as much as digits as its factorization.

28871665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7559.

The product of its digits is 161280, while the sum is 43.

The square root of 28871665 is about 5373.2359896063. The cubic root of 28871665 is about 306.7778103492. Note that the first 3 decimals are identical.

The spelling of 28871665 in words is "twenty-eight million, eight hundred seventy-one thousand, six hundred sixty-five".