6640022040 has 32 divisors (see below), whose sum is σ = 19920066480. Its totient is φ = 1770672512.

The previous prime is 6640021951. The next prime is 6640022047. The reversal of 6640022040 is 402200466.

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 6640022040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640022047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27666639 + ... + 27666878.

Almost surely, 2^6640022040 is an apocalyptic number.

6640022040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6640022040 is an abundant number, since it is smaller than the sum of its proper divisors (13280044440).

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

6640022040 is a wasteful number, since it uses less digits than its factorization.

6640022040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55333531 (or 55333527 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 6640022040 is about 81486.3303873723. The cubic root of 6640022040 is about 1879.5613545810.

The spelling of 6640022040 in words is "six billion, six hundred forty million, twenty-two thousand, forty".