28322660 has 36 divisors (see below), whose sum is σ = 62199228. Its totient is φ = 10832448.

The previous prime is 28322653. The next prime is 28322687. The reversal of 28322660 is 6622382.

It can be written as a sum of positive squares in 2 ways, for example, as 4096576 + 24226084 = 2024^2 + 4922^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9242 + ... + 11918.

Almost surely, 2^28322660 is an apocalyptic number.

28322660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28322660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31099614).

28322660 is an abundant number, since it is smaller than the sum of its proper divisors (33876568).

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

28322660 is a wasteful number, since it uses less digits than its factorization.

28322660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 28322660 is about 5321.9037946960. The cubic root of 28322660 is about 304.8208569071.

It can be divided in two parts, 28322 and 660, that added together give a palindrome (28982).

The spelling of 28322660 in words is "twenty-eight million, three hundred twenty-two thousand, six hundred sixty".