32220640 has 48 divisors (see below), whose sum is σ = 76501152. Its totient is φ = 12824064.

The previous prime is 32220623. The next prime is 32220647. The reversal of 32220640 is 4602223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32220647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43957 + ... + 44683.

It is an arithmetic number, because the mean of its divisors is an integer number (1593774).

Almost surely, 2^32220640 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 32220640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38250576).

32220640 is an abundant number, since it is smaller than the sum of its proper divisors (44280512).

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

32220640 is a wasteful number, since it uses less digits than its factorization.

32220640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019 (or 1011 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 32220640 is about 5676.3227533325. The cubic root of 32220640 is about 318.2082151013.

Adding to 32220640 its reverse (4602223), we get a palindrome (36822863).

The spelling of 32220640 in words is "thirty-two million, two hundred twenty thousand, six hundred forty".