181220704 has 48 divisors (see below), whose sum is σ = 410423328. Its totient is φ = 77156352.

The previous prime is 181220671. The next prime is 181220717. The reversal of 181220704 is 407022181.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32592 + ... + 37744.

It is an arithmetic number, because the mean of its divisors is an integer number (8550486).

Almost surely, 2^181220704 is an apocalyptic number.

181220704 is a gapful number since it is divisible by the number (14) 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 181220704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205211664).

181220704 is an abundant number, since it is smaller than the sum of its proper divisors (229202624).

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

181220704 is a wasteful number, since it uses less digits than its factorization.

181220704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5327 (or 5319 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 181220704 is about 13461.8239477420. The cubic root of 181220704 is about 565.8951055683.

Adding to 181220704 its reverse (407022181), we get a palindrome (588242885).

The spelling of 181220704 in words is "one hundred eighty-one million, two hundred twenty thousand, seven hundred four".