1944888865920 has 2048 divisors, whose sum is σ = 9307726848000. Its totient is φ = 370660147200.

The previous prime is 1944888865873. The next prime is 1944888865921. The reversal of 1944888865920 is 295688884491.

1944888865920 is a `hidden beast` number, since 1 + 9 + 4 + 488 + 88 + 65 + 9 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (1944888865921) 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 255 ways as a sum of consecutive naturals, for example, 3961076875 + ... + 3961077365.

It is an arithmetic number, because the mean of its divisors is an integer number (4544788500).

Almost surely, 2^{1944888865920} is an apocalyptic number.

1944888865920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1944888865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4653863424000).

1944888865920 is an abundant number, since it is smaller than the sum of its proper divisors (7362837982080).

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

1944888865920 is a wasteful number, since it uses less digits than its factorization.

1944888865920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 318504960, while the sum is 72.

The spelling of 1944888865920 in words is "one trillion, nine hundred forty-four billion, eight hundred eighty-eight million, eight hundred sixty-five thousand, nine hundred twenty".