181240628 has 24 divisors (see below), whose sum is σ = 322728000. Its totient is φ = 89039808.

The previous prime is 181240627. The next prime is 181240649. The reversal of 181240628 is 826042181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 181240594 and 181240603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181240627) by changing a digit.

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, 159968 + ... + 161096.

It is an arithmetic number, because the mean of its divisors is an integer number (13447000).

Almost surely, 2^181240628 is an apocalyptic number.

It is an amenable number.

181240628 is a deficient number, since it is larger than the sum of its proper divisors (141487372).

181240628 is a wasteful number, since it uses less digits than its factorization.

181240628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799 (or 1797 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 181240628 is about 13462.5639459948. The cubic root of 181240628 is about 565.9158435978.

The spelling of 181240628 in words is "one hundred eighty-one million, two hundred forty thousand, six hundred twenty-eight".