9997789040 has 80 divisors (see below), whose sum is σ = 24326568000. Its totient is φ = 3814035456.

The previous prime is 9997789031. The next prime is 9997789049. The reversal of 9997789040 is 409877999.

9997789040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9997789031) and next prime (9997789049).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997789049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 634376 + ... + 649944.

It is an arithmetic number, because the mean of its divisors is an integer number (304082100).

Almost surely, 2^9997789040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9997789040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12163284000).

9997789040 is an abundant number, since it is smaller than the sum of its proper divisors (14328778960).

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

9997789040 is a wasteful number, since it uses less digits than its factorization.

9997789040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15954 (or 15948 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 62.

The square root of 9997789040 is about 99988.9445888894. The cubic root of 9997789040 is about 2154.2758993646.

The spelling of 9997789040 in words is "nine billion, nine hundred ninety-seven million, seven hundred eighty-nine thousand, forty".