28783171 has 4 divisors (see below), whose sum is σ = 28795144. Its totient is φ = 28771200.

The previous prime is 28783141. The next prime is 28783199. The reversal of 28783171 is 17138782.

28783171 = T₄₃₇₉ + T₄₃₈₀ + T₄₃₈₁.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28783171 - 2¹⁹ = 28258883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28783171.

It is not an unprimeable number, because it can be changed into a prime (28783121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990 + ... + 7651.

It is an arithmetic number, because the mean of its divisors is an integer number (7198786).

Almost surely, 2^28783171 is an apocalyptic number.

28783171 is the 4381-st centered triangular number.

28783171 is a deficient number, since it is larger than the sum of its proper divisors (11973).

28783171 is an equidigital number, since it uses as much as digits as its factorization.

28783171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11972.

The product of its digits is 18816, while the sum is 37.

The square root of 28783171 is about 5364.9949673788. The cubic root of 28783171 is about 306.4640565955.

The spelling of 28783171 in words is "twenty-eight million, seven hundred eighty-three thousand, one hundred seventy-one".