6640480 has 144 divisors (see below), whose sum is σ = 20109600. Its totient is φ = 2069760.

The previous prime is 6640477. The next prime is 6640493. The reversal of 6640480 is 840466.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 603675 + ... + 603685.

It is an arithmetic number, because the mean of its divisors is an integer number (139650).

Almost surely, 2^6640480 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 6640480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10054800).

6640480 is an abundant number, since it is smaller than the sum of its proper divisors (13469120).

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

6640480 is a wasteful number, since it uses less digits than its factorization.

6640480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58 (or 25 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 6640480 is about 2576.9128817250. The cubic root of 6640480 is about 187.9604564484.

The spelling of 6640480 in words is "six million, six hundred forty thousand, four hundred eighty".