28144263 has 16 divisors (see below), whose sum is σ = 45144320. Its totient is φ = 15235776.

The previous prime is 28144261. The next prime is 28144267. The reversal of 28144263 is 36244182.

It is not a de Polignac number, because 28144263 - 2¹ = 28144261 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 28144263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28144261) 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, 34870 + ... + 35667.

It is an arithmetic number, because the mean of its divisors is an integer number (2821520).

Almost surely, 2^28144263 is an apocalyptic number.

28144263 is a deficient number, since it is larger than the sum of its proper divisors (17000057).

28144263 is a wasteful number, since it uses less digits than its factorization.

28144263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70566.

The product of its digits is 9216, while the sum is 30.

The square root of 28144263 is about 5305.1166810919. The cubic root of 28144263 is about 304.1795129455.

It can be divided in two parts, 281 and 44263, that added together give a palindrome (44544).

The spelling of 28144263 in words is "twenty-eight million, one hundred forty-four thousand, two hundred sixty-three".