8621220 has 24 divisors (see below), whose sum is σ = 24139584. Its totient is φ = 2298976.

The previous prime is 8621213. The next prime is 8621237. The reversal of 8621220 is 221268.

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, 71784 + ... + 71903.

It is an arithmetic number, because the mean of its divisors is an integer number (1005816).

Almost surely, 2^8621220 is an apocalyptic number.

It is an amenable number.

8621220 is an abundant number, since it is smaller than the sum of its proper divisors (15518364).

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

8621220 is a wasteful number, since it uses less digits than its factorization.

8621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143699 (or 143697 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 8621220 is about 2936.1914106543. The cubic root of 8621220 is about 205.0483328432.

Adding to 8621220 its reverse (221268), we get a palindrome (8842488).

The spelling of 8621220 in words is "eight million, six hundred twenty-one thousand, two hundred twenty".