9644742388 has 24 divisors (see below), whose sum is σ = 17166711240. Its totient is φ = 4740595200.

The previous prime is 9644742287. The next prime is 9644742389. The reversal of 9644742388 is 8832474469.

It can be written as a sum of positive squares in 4 ways, for example, as 4952218384 + 4692524004 = 70372^2 + 68502^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9644742389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16713 + ... + 139888.

It is an arithmetic number, because the mean of its divisors is an integer number (715279635).

Almost surely, 2^9644742388 is an apocalyptic number.

It is an amenable number.

9644742388 is a deficient number, since it is larger than the sum of its proper divisors (7521968852).

9644742388 is a wasteful number, since it uses less digits than its factorization.

9644742388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156867 (or 156865 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 55.

The square root of 9644742388 is about 98207.6493354769. The cubic root of 9644742388 is about 2128.6138194436.

The spelling of 9644742388 in words is "nine billion, six hundred forty-four million, seven hundred forty-two thousand, three hundred eighty-eight".