81282484 has 12 divisors (see below), whose sum is σ = 142384900. Its totient is φ = 40601088.

The previous prime is 81282473. The next prime is 81282497. The reversal of 81282484 is 48428218.

It can be written as a sum of positive squares in 2 ways, for example, as 54346384 + 26936100 = 7372^2 + 5190^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5229 + ... + 13780.

Almost surely, 2^81282484 is an apocalyptic number.

It is an amenable number.

81282484 is a deficient number, since it is larger than the sum of its proper divisors (61102416).

81282484 is a wasteful number, since it uses less digits than its factorization.

81282484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20082 (or 20080 counting only the distinct ones).

The product of its digits is 32768, while the sum is 37.

The square root of 81282484 is about 9015.6798967133. The cubic root of 81282484 is about 433.1772658231.

The spelling of 81282484 in words is "eighty-one million, two hundred eighty-two thousand, four hundred eighty-four".