28771165 has 4 divisors (see below), whose sum is σ = 34525404. Its totient is φ = 23016928.

The previous prime is 28771139. The next prime is 28771177. The reversal of 28771165 is 56117782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 19686969 = 3014^2 + 4437^2 .

It is a cyclic number.

It is not a de Polignac number, because 28771165 - 2⁹ = 28770653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2877112 + ... + 2877121.

It is an arithmetic number, because the mean of its divisors is an integer number (8631351).

Almost surely, 2^28771165 is an apocalyptic number.

It is an amenable number.

28771165 is a deficient number, since it is larger than the sum of its proper divisors (5754239).

28771165 is an equidigital number, since it uses as much as digits as its factorization.

28771165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5754238.

The product of its digits is 23520, while the sum is 37.

The square root of 28771165 is about 5363.8759307053. The cubic root of 28771165 is about 306.4214400359.

The spelling of 28771165 in words is "twenty-eight million, seven hundred seventy-one thousand, one hundred sixty-five".