8443273664 has 112 divisors (see below), whose sum is σ = 19762256640. Its totient is φ = 3503831040.

The previous prime is 8443273661. The next prime is 8443273667. The reversal of 8443273664 is 4663723448.

It is an interprime number because it is at equal distance from previous prime (8443273661) and next prime (8443273667).

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8443273661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2551499 + ... + 2554805.

It is an arithmetic number, because the mean of its divisors is an integer number (176448720).

Almost surely, 2^8443273664 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 8443273664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9881128320).

8443273664 is an abundant number, since it is smaller than the sum of its proper divisors (11318982976).

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

8443273664 is a wasteful number, since it uses less digits than its factorization.

8443273664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506 (or 3496 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 47.

The square root of 8443273664 is about 91887.2878259011. The cubic root of 8443273664 is about 2036.2774661318.

The spelling of 8443273664 in words is "eight billion, four hundred forty-three million, two hundred seventy-three thousand, six hundred sixty-four".