81481480 has 16 divisors (see below), whose sum is σ = 183333420. Its totient is φ = 32592576.

The previous prime is 81481457. The next prime is 81481483. The reversal of 81481480 is 8418418.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 79459396 + 2022084 = 8914^2 + 1422^2 .

It is not an unprimeable number, because it can be changed into a prime (81481483) 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 3 ways as a sum of consecutive naturals, for example, 1018479 + ... + 1018558.

Almost surely, 2^81481480 is an apocalyptic number.

It is an amenable number.

81481480 is an abundant number, since it is smaller than the sum of its proper divisors (101851940).

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

81481480 is a wasteful number, since it uses less digits than its factorization.

81481480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037048 (or 2037044 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 81481480 is about 9026.7092564234. The cubic root of 81481480 is about 433.5304796563.

Adding to 81481480 its reverse (8418418), we get a palindrome (89899898).

The spelling of 81481480 in words is "eighty-one million, four hundred eighty-one thousand, four hundred eighty".