81580482 has 36 divisors (see below), whose sum is σ = 178794486. Its totient is φ = 26883360.

The previous prime is 81580469. The next prime is 81580487. The reversal of 81580482 is 28408518.

It can be written as a sum of positive squares in only one way, i.e., 64016001 + 17564481 = 8001^2 + 4191^2 .

It is not an unprimeable number, because it can be changed into a prime (81580487) 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 17 ways as a sum of consecutive naturals, for example, 290182 + ... + 290462.

Almost surely, 2^81580482 is an apocalyptic number.

81580482 is an abundant number, since it is smaller than the sum of its proper divisors (97214004).

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

81580482 is a wasteful number, since it uses less digits than its factorization.

81580482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 81580482 is about 9032.1914284408. The cubic root of 81580482 is about 433.7059919861.

The spelling of 81580482 in words is "eighty-one million, five hundred eighty thousand, four hundred eighty-two".