6640032 has 96 divisors (see below), whose sum is σ = 20490624. Its totient is φ = 1843200.

The previous prime is 6640027. The next prime is 6640061. The reversal of 6640032 is 2300466.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×6640032² = 88180049922048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 6639990 and 6640008.

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, 27432 + ... + 27672.

It is an arithmetic number, because the mean of its divisors is an integer number (213444).

Almost surely, 2^6640032 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 6640032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10245312).

6640032 is an abundant number, since it is smaller than the sum of its proper divisors (13850592).

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

6640032 is a wasteful number, since it uses less digits than its factorization.

6640032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 6640032 is about 2576.8259545417. The cubic root of 6640032 is about 187.9562294358.

Adding to 6640032 its reverse (2300466), we get a palindrome (8940498).

The spelling of 6640032 in words is "six million, six hundred forty thousand, thirty-two".