28556871 has 16 divisors (see below), whose sum is σ = 44442624. Its totient is φ = 15970464.

The previous prime is 28556831. The next prime is 28556873. The reversal of 28556871 is 17865582.

It is not a de Polignac number, because 28556871 - 2⁷ = 28556743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28556873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13480 + ... + 15453.

It is an arithmetic number, because the mean of its divisors is an integer number (2777664).

Almost surely, 2^28556871 is an apocalyptic number.

28556871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28556871 is a deficient number, since it is larger than the sum of its proper divisors (15885753).

28556871 is a wasteful number, since it uses less digits than its factorization.

28556871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28990.

The product of its digits is 134400, while the sum is 42.

The square root of 28556871 is about 5343.8629286313. The cubic root of 28556871 is about 305.6587785149.

The spelling of 28556871 in words is "twenty-eight million, five hundred fifty-six thousand, eight hundred seventy-one".