32216640 has 112 divisors (see below), whose sum is σ = 105168192. Its totient is φ = 8349696.

The previous prime is 32216627. The next prime is 32216641. The reversal of 32216640 is 4661223.

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 32216640.

It is not an unprimeable number, because it can be changed into a prime (32216641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35067 + ... + 35973.

Almost surely, 2^32216640 is an apocalyptic number.

32216640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 32216640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52584096).

32216640 is an abundant number, since it is smaller than the sum of its proper divisors (72951552).

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

32216640 is a wasteful number, since it uses less digits than its factorization.

32216640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 32216640 is about 5675.9704016142. The cubic root of 32216640 is about 318.1950466733.

Adding to 32216640 its reverse (4661223), we get a palindrome (36877863).

The spelling of 32216640 in words is "thirty-two million, two hundred sixteen thousand, six hundred forty".