181230720 has 128 divisors (see below), whose sum is σ = 630262080. Its totient is φ = 43929600.

The previous prime is 181230697. The next prime is 181230733. The reversal of 181230720 is 27032181.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 16830 + ... + 25410.

Almost surely, 2^181230720 is an apocalyptic number.

181230720 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 181230720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315131040).

181230720 is an abundant number, since it is smaller than the sum of its proper divisors (449031360).

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

181230720 is a wasteful number, since it uses less digits than its factorization.

181230720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8614 (or 8602 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 181230720 is about 13462.1959575695. The cubic root of 181230720 is about 565.9055309793.

The spelling of 181230720 in words is "one hundred eighty-one million, two hundred thirty thousand, seven hundred twenty".