187728506 has 24 divisors (see below), whose sum is σ = 332467776. Its totient is φ = 79251480.

The previous prime is 187728503. The next prime is 187728509. The reversal of 187728506 is 605827781.

187728506 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 (187728503) and next prime (187728509).

It is not an unprimeable number, because it can be changed into a prime (187728503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7730 + ... + 20861.

It is an arithmetic number, because the mean of its divisors is an integer number (13852824).

Almost surely, 2^187728506 is an apocalyptic number.

187728506 is a deficient number, since it is larger than the sum of its proper divisors (144739270).

187728506 is a wasteful number, since it uses less digits than its factorization.

187728506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28674 (or 28667 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 44.

The square root of 187728506 is about 13701.4052563961. The cubic root of 187728506 is about 572.5895371741.

The spelling of 187728506 in words is "one hundred eighty-seven million, seven hundred twenty-eight thousand, five hundred six".