6640454240 has 96 divisors (see below), whose sum is σ = 18097115904. Its totient is φ = 2255408640.

The previous prime is 6640454237. The next prime is 6640454251. The reversal of 6640454240 is 424540466.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 6640454240.

It is a congruent number.

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, 92135 + ... + 147545.

It is an arithmetic number, because the mean of its divisors is an integer number (188511624).

Almost surely, 2^6640454240 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 6640454240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9048557952).

6640454240 is an abundant number, since it is smaller than the sum of its proper divisors (11456661664).

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

6640454240 is a wasteful number, since it uses less digits than its factorization.

6640454240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55540 (or 55532 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

The square root of 6640454240 is about 81488.9823227656. The cubic root of 6640454240 is about 1879.6021340035.

The spelling of 6640454240 in words is "six billion, six hundred forty million, four hundred fifty-four thousand, two hundred forty".