181481472 has 130 divisors (see below), whose sum is σ = 543128828. Its totient is φ = 60383232.

The previous prime is 181481459. The next prime is 181481479. The reversal of 181481472 is 274184181.

181481472 is a `hidden beast` number, since 181 + 4 + 8 + 1 + 472 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (181481479) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 331503 + ... + 332049.

Almost surely, 2^181481472 is an apocalyptic number.

181481472 is a gapful number since it is divisible by the number (12) 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 181481472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271564414).

181481472 is an abundant number, since it is smaller than the sum of its proper divisors (361647356).

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

181481472 is an frugal number, since it uses more digits than its factorization.

181481472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 552 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 181481472 is about 13471.5059291825. The cubic root of 181481472 is about 566.1664075542.

The spelling of 181481472 in words is "one hundred eighty-one million, four hundred eighty-one thousand, four hundred seventy-two".