28281456 has 60 divisors (see below), whose sum is σ = 90458992. Its totient is φ = 8080128.

The previous prime is 28281439. The next prime is 28281457. The reversal of 28281456 is 65418282.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28281456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28281457) 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 11 ways as a sum of consecutive naturals, for example, 13021 + ... + 15036.

Almost surely, 2^28281456 is an apocalyptic number.

It is an amenable number.

28281456 is an abundant number, since it is smaller than the sum of its proper divisors (62177536).

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

28281456 is a wasteful number, since it uses less digits than its factorization.

28281456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28078 (or 28069 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 28281456 is about 5318.0312146508. The cubic root of 28281456 is about 304.6729666756.

The spelling of 28281456 in words is "twenty-eight million, two hundred eighty-one thousand, four hundred fifty-six".