28855871 has 8 divisors (see below), whose sum is σ = 31519488. Its totient is φ = 26199000.

The previous prime is 28855861. The next prime is 28855873. The reversal of 28855871 is 17855882.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28855871 is a prime.

It is a super-2 number, since 2×28855871² = 1665322582337282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28855873) 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, 12476 + ... + 14606.

It is an arithmetic number, because the mean of its divisors is an integer number (3939936).

Almost surely, 2^28855871 is an apocalyptic number.

28855871 is a deficient number, since it is larger than the sum of its proper divisors (2663617).

28855871 is a wasteful number, since it uses less digits than its factorization.

28855871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373.

The product of its digits is 179200, while the sum is 44.

The square root of 28855871 is about 5371.7660969182. The cubic root of 28855871 is about 306.7218600773.

The spelling of 28855871 in words is "twenty-eight million, eight hundred fifty-five thousand, eight hundred seventy-one".