181044820 has 48 divisors (see below), whose sum is σ = 422610048. Its totient is φ = 64588160.

The previous prime is 181044803. The next prime is 181044833. The reversal of 181044820 is 28440181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3897 + ... + 19423.

It is an arithmetic number, because the mean of its divisors is an integer number (8804376).

Almost surely, 2^181044820 is an apocalyptic number.

181044820 is a gapful number since it is divisible by the number (10) 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 181044820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211305024).

181044820 is an abundant number, since it is smaller than the sum of its proper divisors (241565228).

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

181044820 is a wasteful number, since it uses less digits than its factorization.

181044820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15600 (or 15598 counting only the distinct ones).

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

The square root of 181044820 is about 13455.2896661499. The cubic root of 181044820 is about 565.7119695539.

The spelling of 181044820 in words is "one hundred eighty-one million, forty-four thousand, eight hundred twenty".