32220656 has 80 divisors (see below), whose sum is σ = 73328640. Its totient is φ = 13582080.

The previous prime is 32220647. The next prime is 32220679. The reversal of 32220656 is 65602223.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122381 + ... + 122643.

It is an arithmetic number, because the mean of its divisors is an integer number (916608).

Almost surely, 2^32220656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 32220656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36664320).

32220656 is an abundant number, since it is smaller than the sum of its proper divisors (41107984).

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

32220656 is a wasteful number, since it uses less digits than its factorization.

32220656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 32220656 is about 5676.3241626954. The cubic root of 32220656 is about 318.2082677728.

Adding to 32220656 its reverse (65602223), we get a palindrome (97822879).

The spelling of 32220656 in words is "thirty-two million, two hundred twenty thousand, six hundred fifty-six".