28002220 has 24 divisors (see below), whose sum is σ = 58910544. Its totient is φ = 11180736.

The previous prime is 28002217. The next prime is 28002241. The reversal of 28002220 is 2220082.

It is a junction number, because it is equal to n+sod(n) for n = 28002194 and 28002203.

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, 15694 + ... + 17386.

It is an arithmetic number, because the mean of its divisors is an integer number (2454606).

Almost surely, 2^28002220 is an apocalyptic number.

28002220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28002220 is an abundant number, since it is smaller than the sum of its proper divisors (30908324).

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

28002220 is a wasteful number, since it uses less digits than its factorization.

28002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529 (or 2527 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 28002220 is about 5291.7123882539. The cubic root of 28002220 is about 303.6669222463. Note that the first 3 decimals are identical.

The spelling of 28002220 in words is "twenty-eight million, two thousand, two hundred twenty".