6640732890 has 384 divisors, whose sum is σ = 20592230400. Its totient is φ = 1519689600.

The previous prime is 6640732877. The next prime is 6640732919. The reversal of 6640732890 is 982370466.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 80008789 + ... + 80008871.

It is an arithmetic number, because the mean of its divisors is an integer number (53625600).

Almost surely, 2^6640732890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6640732890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10296115200).

6640732890 is an abundant number, since it is smaller than the sum of its proper divisors (13951497510).

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

6640732890 is a wasteful number, since it uses less digits than its factorization.

6640732890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 6640732890 is about 81490.6920451655. The cubic root of 6640732890 is about 1879.6284245649.

The spelling of 6640732890 in words is "six billion, six hundred forty million, seven hundred thirty-two thousand, eight hundred ninety".