181478816 has 12 divisors (see below), whose sum is σ = 357286482. Its totient is φ = 90739392.

The previous prime is 181478783. The next prime is 181478863. The reversal of 181478816 is 618874181.

It can be written as a sum of positive squares in only one way, i.e., 152275600 + 29203216 = 12340^2 + 5404^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2835575 + ... + 2835638.

Almost surely, 2^181478816 is an apocalyptic number.

181478816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181478816 is a deficient number, since it is larger than the sum of its proper divisors (175807666).

181478816 is an equidigital number, since it uses as much as digits as its factorization.

181478816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5671223 (or 5671215 counting only the distinct ones).

The product of its digits is 86016, while the sum is 44.

The square root of 181478816 is about 13471.4073503847. The cubic root of 181478816 is about 566.1636455728.

The spelling of 181478816 in words is "one hundred eighty-one million, four hundred seventy-eight thousand, eight hundred sixteen".