32222720 has 80 divisors (see below), whose sum is σ = 79401168. Its totient is φ = 12533760.

The previous prime is 32222681. The next prime is 32222731. The reversal of 32222720 is 2722223.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 32222692 and 32222701.

It is a congruent number.

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, 104807 + ... + 105113.

Almost surely, 2^32222720 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 32222720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39700584).

32222720 is an abundant number, since it is smaller than the sum of its proper divisors (47178448).

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

32222720 is an equidigital number, since it uses as much as digits as its factorization.

32222720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 32222720 is about 5676.5059675825. The cubic root of 32222720 is about 318.2150622531.

Adding to 32222720 its reverse (2722223), we get a palindrome (34944943).

The spelling of 32222720 in words is "thirty-two million, two hundred twenty-two thousand, seven hundred twenty".