9947668644 has 63 divisors (see below), whose sum is σ = 26114829307. Its totient is φ = 3314094264.

The previous prime is 9947668637. The next prime is 9947668649. The reversal of 9947668644 is 4468667499.

The square root of 9947668644 is 99738.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×9947668644² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9947668649) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 5384929 + ... + 5386775.

Almost surely, 2^9947668644 is an apocalyptic number.

9947668644 is the 99738-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9947668644

9947668644 is an abundant number, since it is smaller than the sum of its proper divisors (16167160663).

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

9947668644 is an frugal number, since it uses more digits than its factorization.

9947668644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716 (or 1852 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 63.

The cubic root of 9947668644 is about 2150.6699656457.

The spelling of 9947668644 in words is "nine billion, nine hundred forty-seven million, six hundred sixty-eight thousand, six hundred forty-four".