9947771250 has 80 divisors (see below), whose sum is σ = 24892781760. Its totient is φ = 2649400000.

The previous prime is 9947771227. The next prime is 9947771269. The reversal of 9947771250 is 521777499.

It is a junction number, because it is equal to n+sod(n) for n = 9947771193 and 9947771202.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4877731 + ... + 4879769.

It is an arithmetic number, because the mean of its divisors is an integer number (311159772).

Almost surely, 2^9947771250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9947771250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12446390880).

9947771250 is an abundant number, since it is smaller than the sum of its proper divisors (14945010510).

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

9947771250 is a wasteful number, since it uses less digits than its factorization.

9947771250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365 (or 3350 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 51.

The square root of 9947771250 is about 99738.5143763431. The cubic root of 9947771250 is about 2150.6773600376.

The spelling of 9947771250 in words is "nine billion, nine hundred forty-seven million, seven hundred seventy-one thousand, two hundred fifty".