188128746 has 48 divisors (see below), whose sum is σ = 449696520. Its totient is φ = 56471040.

The previous prime is 188128729. The next prime is 188128763. The reversal of 188128746 is 647821881.

188128746 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (188128729) and next prime (188128763).

It can be written as a sum of positive squares in 4 ways, for example, as 145082025 + 43046721 = 12045^2 + 6561^2 .

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 211 + ... + 19398.

Almost surely, 2^188128746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 188128746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224848260).

188128746 is an abundant number, since it is smaller than the sum of its proper divisors (261567774).

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

188128746 is a wasteful number, since it uses less digits than its factorization.

188128746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19671 (or 19668 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 188128746 is about 13716.0032808395. The cubic root of 188128746 is about 572.9961714975.

The spelling of 188128746 in words is "one hundred eighty-eight million, one hundred twenty-eight thousand, seven hundred forty-six".