6506747640 has 96 divisors (see below), whose sum is σ = 21189561120. Its totient is φ = 1731634944.

The previous prime is 6506747629. The next prime is 6506747641. The reversal of 6506747640 is 467476056.

It is a happy number.

6506747640 is a `hidden beast` number, since 6 + 506 + 74 + 76 + 4 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6506747641) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 163114 + ... + 199046.

It is an arithmetic number, because the mean of its divisors is an integer number (220724595).

Almost surely, 2^6506747640 is an apocalyptic number.

6506747640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6506747640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10594780560).

6506747640 is an abundant number, since it is smaller than the sum of its proper divisors (14682813480).

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

6506747640 is a wasteful number, since it uses less digits than its factorization.

6506747640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36453 (or 36446 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The square root of 6506747640 is about 80664.4137150950. The cubic root of 6506747640 is about 1866.9011407560.

The spelling of 6506747640 in words is "six billion, five hundred six million, seven hundred forty-seven thousand, six hundred forty".