6640262620 has 48 divisors (see below), whose sum is σ = 14457542400. Its totient is φ = 2559144960.

The previous prime is 6640262597. The next prime is 6640262623. The reversal of 6640262620 is 262620466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640262623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118596 + ... + 165364.

It is an arithmetic number, because the mean of its divisors is an integer number (301198800).

Almost surely, 2^6640262620 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 6640262620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7228771200).

6640262620 is an abundant number, since it is smaller than the sum of its proper divisors (7817279780).

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

6640262620 is a wasteful number, since it uses less digits than its factorization.

6640262620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47038 (or 47036 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 6640262620 is about 81487.8065725173. The cubic root of 6640262620 is about 1879.5840542752.

The spelling of 6640262620 in words is "six billion, six hundred forty million, two hundred sixty-two thousand, six hundred twenty".