28224280 has 32 divisors (see below), whose sum is σ = 72577440. Its totient is φ = 9676800.

The previous prime is 28224271. The next prime is 28224293. The reversal of 28224280 is 8242282.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

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, 50121 + ... + 50680.

It is an arithmetic number, because the mean of its divisors is an integer number (2268045).

Almost surely, 2^28224280 is an apocalyptic number.

28224280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28224280 is an abundant number, since it is smaller than the sum of its proper divisors (44353160).

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

28224280 is a wasteful number, since it uses less digits than its factorization.

28224280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100819 (or 100815 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 28224280 is about 5312.6528213314. The cubic root of 28224280 is about 304.4675112712.

The spelling of 28224280 in words is "twenty-eight million, two hundred twenty-four thousand, two hundred eighty".