8220840 has 32 divisors (see below), whose sum is σ = 24662880. Its totient is φ = 2192192.

The previous prime is 8220803. The next prime is 8220851. The reversal of 8220840 is 480228.

8220840 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 8220840.

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, 34134 + ... + 34373.

It is an arithmetic number, because the mean of its divisors is an integer number (770715).

Almost surely, 2^8220840 is an apocalyptic number.

It is an amenable number.

8220840 is an abundant number, since it is smaller than the sum of its proper divisors (16442040).

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

8220840 is a wasteful number, since it uses less digits than its factorization.

8220840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68521 (or 68517 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 8220840 is about 2867.2007254463. The cubic root of 8220840 is about 201.8236542185.

The spelling of 8220840 in words is "eight million, two hundred twenty thousand, eight hundred forty".