9789991652 has 36 divisors (see below), whose sum is σ = 20012417964. Its totient is φ = 4178280960.

The previous prime is 9789991639. The next prime is 9789991657. The reversal of 9789991652 is 2561999879.

9789991652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7093682176 + 2696309476 = 84224^2 + 51926^2 .

It is not an unprimeable number, because it can be changed into a prime (9789991657) 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 11 ways as a sum of consecutive naturals, for example, 56393 + ... + 150864.

It is an arithmetic number, because the mean of its divisors is an integer number (555900499).

Almost surely, 2^9789991652 is an apocalyptic number.

It is an amenable number.

9789991652 is an abundant number, since it is smaller than the sum of its proper divisors (10222426312).

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

9789991652 is a wasteful number, since it uses less digits than its factorization.

9789991652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207516 (or 207507 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 65.

The square root of 9789991652 is about 98944.3866624075. The cubic root of 9789991652 is about 2139.2462227204.

The spelling of 9789991652 in words is "nine billion, seven hundred eighty-nine million, nine hundred ninety-one thousand, six hundred fifty-two".