181728730 has 32 divisors (see below), whose sum is σ = 345087360. Its totient is φ = 68713920.

The previous prime is 181728697. The next prime is 181728731. The reversal of 181728730 is 37827181.

It is a self number, because there is not a number n which added to its sum of digits gives 181728730.

It is not an unprimeable number, because it can be changed into a prime (181728731) 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 15 ways as a sum of consecutive naturals, for example, 124867 + ... + 126313.

It is an arithmetic number, because the mean of its divisors is an integer number (10783980).

Almost surely, 2^181728730 is an apocalyptic number.

181728730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181728730 is a deficient number, since it is larger than the sum of its proper divisors (163358630).

181728730 is a wasteful number, since it uses less digits than its factorization.

181728730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 181728730 is about 13480.6798789972. The cubic root of 181728730 is about 566.4234138561.

The spelling of 181728730 in words is "one hundred eighty-one million, seven hundred twenty-eight thousand, seven hundred thirty".