189757128840 has 128 divisors (see below), whose sum is σ = 581908561920. Its totient is φ = 49480544000.

The previous prime is 189757128839. The next prime is 189757128863. The reversal of 189757128840 is 48821757981.

189757128840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6477025 + ... + 6506255.

It is an arithmetic number, because the mean of its divisors is an integer number (4546160640).

Almost surely, 2^189757128840 is an apocalyptic number.

189757128840 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 189757128840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290954280960).

189757128840 is an abundant number, since it is smaller than the sum of its proper divisors (392151433080).

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

189757128840 is a wasteful number, since it uses less digits than its factorization.

189757128840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30443 (or 30439 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 60.

The spelling of 189757128840 in words is "one hundred eighty-nine billion, seven hundred fifty-seven million, one hundred twenty-eight thousand, eight hundred forty".