8128220 has 24 divisors (see below), whose sum is σ = 17164224. Its totient is φ = 3233216.

The previous prime is 8128217. The next prime is 8128243. The reversal of 8128220 is 228218.

It is a congruent number.

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, 2909 + ... + 4971.

It is an arithmetic number, because the mean of its divisors is an integer number (715176).

Almost surely, 2^8128220 is an apocalyptic number.

It is an amenable number.

8128220 is an abundant number, since it is smaller than the sum of its proper divisors (9036004).

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

8128220 is a wasteful number, since it uses less digits than its factorization.

8128220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2269 (or 2267 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 8128220 is about 2851.0033321622. The cubic root of 8128220 is about 201.0628418310.

The spelling of 8128220 in words is "eight million, one hundred twenty-eight thousand, two hundred twenty".