28221260 has 24 divisors (see below), whose sum is σ = 59364816. Its totient is φ = 11269440.

The previous prime is 28221229. The next prime is 28221283. The reversal of 28221260 is 6212282.

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, 21215 + ... + 22505.

It is an arithmetic number, because the mean of its divisors is an integer number (2473534).

Almost surely, 2^28221260 is an apocalyptic number.

28221260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28221260 is an abundant number, since it is smaller than the sum of its proper divisors (31143556).

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

28221260 is a wasteful number, since it uses less digits than its factorization.

28221260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393 (or 2391 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 28221260 is about 5312.3685866099. The cubic root of 28221260 is about 304.4566515352.

The spelling of 28221260 in words is "twenty-eight million, two hundred twenty-one thousand, two hundred sixty".