9947529840 has 80 divisors (see below), whose sum is σ = 30893120928. Its totient is φ = 2647876608.

The previous prime is 9947529833. The next prime is 9947529847. The reversal of 9947529840 is 489257499.

It is an interprime number because it is at equal distance from previous prime (9947529833) and next prime (9947529847).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9947529847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96474 + ... + 170886.

Almost surely, 2^9947529840 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 9947529840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15446560464).

9947529840 is an abundant number, since it is smaller than the sum of its proper divisors (20945591088).

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

9947529840 is a wasteful number, since it uses less digits than its factorization.

9947529840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74986 (or 74980 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 57.

The square root of 9947529840 is about 99737.3041544637. The cubic root of 9947529840 is about 2150.6599625319.

The spelling of 9947529840 in words is "nine billion, nine hundred forty-seven million, five hundred twenty-nine thousand, eight hundred forty".