8387747640 has 384 divisors, whose sum is σ = 31248322560. Its totient is φ = 2012719104.

The previous prime is 8387747609. The next prime is 8387747647. The reversal of 8387747640 is 467477838.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8387747647) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3799417 + ... + 3801623.

It is an arithmetic number, because the mean of its divisors is an integer number (81375840).

Almost surely, 2^8387747640 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 8387747640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15624161280).

8387747640 is an abundant number, since it is smaller than the sum of its proper divisors (22860574920).

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

8387747640 is a wasteful number, since it uses less digits than its factorization.

8387747640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273 (or 2257 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 54.

The square root of 8387747640 is about 91584.6474033721. The cubic root of 8387747640 is about 2031.8038792004.

The spelling of 8387747640 in words is "eight billion, three hundred eighty-seven million, seven hundred forty-seven thousand, six hundred forty".