32404240 has 80 divisors (see below), whose sum is σ = 85815936. Its totient is φ = 11264000.

The previous prime is 32404213. The next prime is 32404243. The reversal of 32404240 is 4240423.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32404243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19440 + ... + 21040.

Almost surely, 2^32404240 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 32404240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42907968).

32404240 is an abundant number, since it is smaller than the sum of its proper divisors (53411696).

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

32404240 is a wasteful number, since it uses less digits than its factorization.

32404240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 32404240 is about 5692.4722221544. The cubic root of 32404240 is about 318.8114765443.

Adding to 32404240 its reverse (4240423), we get a palindrome (36644663).

The spelling of 32404240 in words is "thirty-two million, four hundred four thousand, two hundred forty".