9894308781 has 48 divisors (see below), whose sum is σ = 15886514688. Its totient is φ = 5455900800.

The previous prime is 9894308747. The next prime is 9894308789. The reversal of 9894308781 is 1878034989.

It is not a de Polignac number, because 9894308781 - 2²¹ = 9892211629 is a prime.

It is a super-2 number, since 2×9894308781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9894308789) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1696851 + ... + 1702671.

It is an arithmetic number, because the mean of its divisors is an integer number (330969056).

Almost surely, 2^9894308781 is an apocalyptic number.

It is an amenable number.

9894308781 is a deficient number, since it is larger than the sum of its proper divisors (5992205907).

9894308781 is a wasteful number, since it uses less digits than its factorization.

9894308781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6242 (or 6235 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 57.

The square root of 9894308781 is about 99470.1401476845. The cubic root of 9894308781 is about 2146.8176305038.

The spelling of 9894308781 in words is "nine billion, eight hundred ninety-four million, three hundred eight thousand, seven hundred eighty-one".