181215480 has 64 divisors (see below), whose sum is σ = 553923360. Its totient is φ = 47410688.

The previous prime is 181215479. The next prime is 181215487. The reversal of 181215480 is 84512181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181215487) 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 15 ways as a sum of consecutive naturals, for example, 7887 + ... + 20606.

Almost surely, 2^181215480 is an apocalyptic number.

181215480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181215480 is an abundant number, since it is smaller than the sum of its proper divisors (372707880).

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

181215480 is a wasteful number, since it uses less digits than its factorization.

181215480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28560 (or 28556 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 181215480 is about 13461.6299161729. The cubic root of 181215480 is about 565.8896678812.

The spelling of 181215480 in words is "one hundred eighty-one million, two hundred fifteen thousand, four hundred eighty".