73481220 has 36 divisors (see below), whose sum is σ = 222893580. Its totient is φ = 19594944.

The previous prime is 73481209. The next prime is 73481263. The reversal of 73481220 is 2218437.

It can be written as a sum of positive squares in 2 ways, for example, as 33942276 + 39538944 = 5826^2 + 6288^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203935 + ... + 204294.

Almost surely, 2^73481220 is an apocalyptic number.

It is an amenable number.

73481220 is an abundant number, since it is smaller than the sum of its proper divisors (149412360).

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

73481220 is a wasteful number, since it uses less digits than its factorization.

73481220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408244 (or 408239 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 73481220 is about 8572.1187579268. The cubic root of 73481220 is about 418.8502568293.

Adding to 73481220 its reverse (2218437), we get a palindrome (75699657).

The spelling of 73481220 in words is "seventy-three million, four hundred eighty-one thousand, two hundred twenty".