28144280 has 32 divisors (see below), whose sum is σ = 65370240. Its totient is φ = 10894080.

The previous prime is 28144279. The next prime is 28144289. The reversal of 28144280 is 8244182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28144289) 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 7 ways as a sum of consecutive naturals, for example, 10109 + ... + 12588.

It is an arithmetic number, because the mean of its divisors is an integer number (2042820).

Almost surely, 2^28144280 is an apocalyptic number.

28144280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28144280 is an abundant number, since it is smaller than the sum of its proper divisors (37225960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28144280 is a wasteful number, since it uses less digits than its factorization.

28144280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22739 (or 22735 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 28144280 is about 5305.1182833185. The cubic root of 28144280 is about 304.1795741901.

The spelling of 28144280 in words is "twenty-eight million, one hundred forty-four thousand, two hundred eighty".