28321260 has 144 divisors (see below), whose sum is σ = 90091008. Its totient is φ = 6638720.

The previous prime is 28321253. The next prime is 28321301. The reversal of 28321260 is 6212382.

It is a self number, because there is not a number n which added to its sum of digits gives 28321260.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 341179 + ... + 341261.

It is an arithmetic number, because the mean of its divisors is an integer number (625632).

Almost surely, 2^28321260 is an apocalyptic number.

28321260 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 28321260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45045504).

28321260 is an abundant number, since it is smaller than the sum of its proper divisors (61769748).

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

28321260 is a wasteful number, since it uses less digits than its factorization.

28321260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28321260 is about 5321.7722611927. The cubic root of 28321260 is about 304.8158343535.

The spelling of 28321260 in words is "twenty-eight million, three hundred twenty-one thousand, two hundred sixty".