9727478640 has 480 divisors, whose sum is σ = 37883289600. Its totient is φ = 2212116480.

The previous prime is 9727478617. The next prime is 9727478641. The reversal of 9727478640 is 468747279.

9727478640 is a `hidden beast` number, since 97 + 27 + 478 + 64 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9727478641) 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, 19110706 + ... + 19111214.

It is an arithmetic number, because the mean of its divisors is an integer number (78923520).

Almost surely, 2^9727478640 is an apocalyptic number.

9727478640 is a gapful number since it is divisible by the number (90) 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 9727478640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18941644800).

9727478640 is an abundant number, since it is smaller than the sum of its proper divisors (28155810960).

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

9727478640 is a wasteful number, since it uses less digits than its factorization.

9727478640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The square root of 9727478640 is about 98627.9810195869. The cubic root of 9727478640 is about 2134.6831823894.

The spelling of 9727478640 in words is "nine billion, seven hundred twenty-seven million, four hundred seventy-eight thousand, six hundred forty".