1889641128 has 64 divisors (see below), whose sum is σ = 4877752320. Its totient is φ = 609638400.

The previous prime is 1889641111. The next prime is 1889641183. The reversal of 1889641128 is 8211469881.

It is a super-2 number, since 2×1889641128² = 7141487185258224768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117408 + ... + 132528.

It is an arithmetic number, because the mean of its divisors is an integer number (76214880).

Almost surely, 2^1889641128 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 1889641128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2438876160).

1889641128 is an abundant number, since it is smaller than the sum of its proper divisors (2988111192).

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

1889641128 is a wasteful number, since it uses less digits than its factorization.

1889641128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15298 (or 15294 counting only the distinct ones).

The product of its digits is 221184, while the sum is 48.

The square root of 1889641128 is about 43470.0026224982. The cubic root of 1889641128 is about 1236.3073302855.

The spelling of 1889641128 in words is "one billion, eight hundred eighty-nine million, six hundred forty-one thousand, one hundred twenty-eight".