1881320064 has 128 divisors (see below), whose sum is σ = 5555719680. Its totient is φ = 560148480.

The previous prime is 1881320027. The next prime is 1881320069. The reversal of 1881320064 is 4600231881.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (1881320069) 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, 148674 + ... + 160830.

It is an arithmetic number, because the mean of its divisors is an integer number (43404060).

Almost surely, 2^1881320064 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 1881320064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2777859840).

1881320064 is an abundant number, since it is smaller than the sum of its proper divisors (3674399616).

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

1881320064 is a wasteful number, since it uses less digits than its factorization.

1881320064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12218 (or 12206 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 1881320064 is about 43374.1866090881. The cubic root of 1881320064 is about 1234.4899605661.

The spelling of 1881320064 in words is "one billion, eight hundred eighty-one million, three hundred twenty thousand, sixty-four".