9932978781 has 32 divisors (see below), whose sum is σ = 16168857600. Its totient is φ = 5976653040.

The previous prime is 9932978749. The next prime is 9932978813. The reversal of 9932978781 is 1878792399.

It is an interprime number because it is at equal distance from previous prime (9932978749) and next prime (9932978813).

It is not a de Polignac number, because 9932978781 - 2⁵ = 9932978749 is a prime.

It is a super-2 number, since 2×9932978781² (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 (9932978581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79021 + ... + 161586.

It is an arithmetic number, because the mean of its divisors is an integer number (505276800).

Almost surely, 2^9932978781 is an apocalyptic number.

It is an amenable number.

9932978781 is a deficient number, since it is larger than the sum of its proper divisors (6235878819).

9932978781 is a wasteful number, since it uses less digits than its factorization.

9932978781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240766 (or 240760 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 9932978781 is about 99664.3305350515. The cubic root of 9932978781 is about 2149.6108025273.

The spelling of 9932978781 in words is "nine billion, nine hundred thirty-two million, nine hundred seventy-eight thousand, seven hundred eighty-one".