9909944782 has 4 divisors (see below), whose sum is σ = 14864917176. Its totient is φ = 4954972390.

The previous prime is 9909944767. The next prime is 9909944789. The reversal of 9909944782 is 2874499099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2874499099 = 44633 ⋅64403.

It is a self number, because there is not a number n which added to its sum of digits gives 9909944782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909944789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2477486194 + ... + 2477486197.

It is an arithmetic number, because the mean of its divisors is an integer number (3716229294).

Almost surely, 2^9909944782 is an apocalyptic number.

9909944782 is a deficient number, since it is larger than the sum of its proper divisors (4954972394).

9909944782 is a wasteful number, since it uses less digits than its factorization.

9909944782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4954972393.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The square root of 9909944782 is about 99548.7055767176. The cubic root of 9909944782 is about 2147.9479090820.

The spelling of 9909944782 in words is "nine billion, nine hundred nine million, nine hundred forty-four thousand, seven hundred eighty-two".