8228720 has 20 divisors (see below), whose sum is σ = 19131960. Its totient is φ = 3291456.

The previous prime is 8228651. The next prime is 8228723. The reversal of 8228720 is 278228.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8228723) 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, 51350 + ... + 51509.

It is an arithmetic number, because the mean of its divisors is an integer number (956598).

Almost surely, 2^8228720 is an apocalyptic number.

8228720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8228720 is an abundant number, since it is smaller than the sum of its proper divisors (10903240).

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

8228720 is a wasteful number, since it uses less digits than its factorization.

8228720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102872 (or 102866 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 8228720 is about 2868.5745589055. The cubic root of 8228720 is about 201.8881189416. Note that the first 3 decimals are identical.

The spelling of 8228720 in words is "eight million, two hundred twenty-eight thousand, seven hundred twenty".