9971220736 has 45 divisors (see below), whose sum is σ = 20158664351. Its totient is φ = 4922501376.

The previous prime is 9971220731. The next prime is 9971220769. The reversal of 9971220736 is 6370221799.

The square root of 9971220736 is 99856.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9971220731) by changing a digit.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 126217945 + ... + 126218023.

Almost surely, 2^9971220736 is an apocalyptic number.

9971220736 is the 99856-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9971220736

9971220736 is an abundant number, since it is smaller than the sum of its proper divisors (10187443615).

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

9971220736 is an frugal number, since it uses more digits than its factorization.

9971220736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 46.

The cubic root of 9971220736 is about 2152.3659360297.

The spelling of 9971220736 in words is "nine billion, nine hundred seventy-one million, two hundred twenty thousand, seven hundred thirty-six".