81282672 has 30 divisors (see below), whose sum is σ = 227478992. Its totient is φ = 27094176.

The previous prime is 81282671. The next prime is 81282689. The reversal of 81282672 is 27628218.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81282671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282088 + ... + 282375.

Almost surely, 2^81282672 is an apocalyptic number.

It is an amenable number.

81282672 is an abundant number, since it is smaller than the sum of its proper divisors (146196320).

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

81282672 is a wasteful number, since it uses less digits than its factorization.

81282672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564477 (or 564468 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 81282672 is about 9015.6903229869. The cubic root of 81282672 is about 433.1775997912.

The spelling of 81282672 in words is "eighty-one million, two hundred eighty-two thousand, six hundred seventy-two".