28321282 has 16 divisors (see below), whose sum is σ = 46584000. Its totient is φ = 12806640.

The previous prime is 28321253. The next prime is 28321301. The reversal of 28321282 is 28212382.

It is a self number, because there is not a number n which added to its sum of digits gives 28321282.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1144 + ... + 7612.

It is an arithmetic number, because the mean of its divisors is an integer number (2911500).

Almost surely, 2^28321282 is an apocalyptic number.

28321282 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28321282 is a deficient number, since it is larger than the sum of its proper divisors (18262718).

28321282 is a wasteful number, since it uses less digits than its factorization.

28321282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6681.

The product of its digits is 3072, while the sum is 28.

The square root of 28321282 is about 5321.7743281729. The cubic root of 28321282 is about 304.8159132806.

Subtracting from 28321282 its reverse (28212382), we obtain a square (108900 = 330²).

It can be divided in two parts, 2832 and 1282, that added together give a palindrome (4114).

The spelling of 28321282 in words is "twenty-eight million, three hundred twenty-one thousand, two hundred eighty-two".