28086220 has 24 divisors (see below), whose sum is σ = 61546464. Its totient is φ = 10745856.

The previous prime is 28086209. The next prime is 28086221. The reversal of 28086220 is 2268082.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28086221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30069 + ... + 30988.

It is an arithmetic number, because the mean of its divisors is an integer number (2564436).

Almost surely, 2^28086220 is an apocalyptic number.

28086220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28086220 is an abundant number, since it is smaller than the sum of its proper divisors (33460244).

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

28086220 is a wasteful number, since it uses less digits than its factorization.

28086220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61089 (or 61087 counting only the distinct ones).

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

The square root of 28086220 is about 5299.6433842288. The cubic root of 28086220 is about 303.9702619802.

The spelling of 28086220 in words is "twenty-eight million, eighty-six thousand, two hundred twenty".