81403332 has 12 divisors (see below), whose sum is σ = 189941136. Its totient is φ = 27134440.

The previous prime is 81403321. The next prime is 81403337. The reversal of 81403332 is 23330418.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (81403337) 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, 3391794 + ... + 3391817.

It is an arithmetic number, because the mean of its divisors is an integer number (15828428).

Almost surely, 2^81403332 is an apocalyptic number.

It is an amenable number.

81403332 is an abundant number, since it is smaller than the sum of its proper divisors (108537804).

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

81403332 is a wasteful number, since it uses less digits than its factorization.

81403332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6783618 (or 6783616 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 81403332 is about 9022.3795087549. The cubic root of 81403332 is about 433.3918372030.

The spelling of 81403332 in words is "eighty-one million, four hundred three thousand, three hundred thirty-two".