8281220 has 12 divisors (see below), whose sum is σ = 17390604. Its totient is φ = 3312480.

The previous prime is 8281201. The next prime is 8281223. The reversal of 8281220 is 221828.

It can be written as a sum of positive squares in 2 ways, for example, as 5098564 + 3182656 = 2258^2 + 1784^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (8281223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207011 + ... + 207050.

It is an arithmetic number, because the mean of its divisors is an integer number (1449217).

Almost surely, 2^8281220 is an apocalyptic number.

It is an amenable number.

8281220 is an abundant number, since it is smaller than the sum of its proper divisors (9109384).

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

8281220 is a wasteful number, since it uses less digits than its factorization.

8281220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414070 (or 414068 counting only the distinct ones).

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

The square root of 8281220 is about 2877.7108958337. The cubic root of 8281220 is about 202.3165640568.

It can be divided in two parts, 828 and 1220, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 8281220 in words is "eight million, two hundred eighty-one thousand, two hundred twenty".