181428220 has 24 divisors (see below), whose sum is σ = 381334464. Its totient is φ = 72507456.

The previous prime is 181428197. The next prime is 181428229. The reversal of 181428220 is 22824181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181428229) 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 7 ways as a sum of consecutive naturals, for example, 24157 + ... + 30763.

It is an arithmetic number, because the mean of its divisors is an integer number (15888936).

Almost surely, 2^181428220 is an apocalyptic number.

181428220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181428220 is an abundant number, since it is smaller than the sum of its proper divisors (199906244).

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

181428220 is a wasteful number, since it uses less digits than its factorization.

181428220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7989 (or 7987 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 181428220 is about 13469.5293162011. The cubic root of 181428220 is about 566.1110255132. Note that the first 3 decimals are identical.

It can be divided in two parts, 18142 and 8220, that added together give a palindrome (26362).

The spelling of 181428220 in words is "one hundred eighty-one million, four hundred twenty-eight thousand, two hundred twenty".