28163965 has 16 divisors (see below), whose sum is σ = 35228160. Its totient is φ = 21591360.

The previous prime is 28163963. The next prime is 28163969. The reversal of 28163965 is 56936182.

It is not a de Polignac number, because 28163965 - 2¹ = 28163963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28163963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16062 + ... + 17728.

It is an arithmetic number, because the mean of its divisors is an integer number (2201760).

Almost surely, 2^28163965 is an apocalyptic number.

It is an amenable number.

28163965 is a deficient number, since it is larger than the sum of its proper divisors (7064195).

28163965 is a wasteful number, since it uses less digits than its factorization.

28163965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812.

The product of its digits is 77760, while the sum is 40.

The square root of 28163965 is about 5306.9732428193. The cubic root of 28163965 is about 304.2504752689.

It can be divided in two parts, 281 and 63965, that added together give a palindrome (64246).

The spelling of 28163965 in words is "twenty-eight million, one hundred sixty-three thousand, nine hundred sixty-five".