81162732 has 48 divisors (see below), whose sum is σ = 217002240. Its totient is φ = 23128512.

The previous prime is 81162707. The next prime is 81162733. The reversal of 81162732 is 23726118.

It is a self number, because there is not a number n which added to its sum of digits gives 81162732.

It is not an unprimeable number, because it can be changed into a prime (81162733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38194 + ... + 40262.

It is an arithmetic number, because the mean of its divisors is an integer number (4520880).

Almost surely, 2^81162732 is an apocalyptic number.

It is an amenable number.

81162732 is an abundant number, since it is smaller than the sum of its proper divisors (135839508).

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

81162732 is a wasteful number, since it uses less digits than its factorization.

81162732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550 (or 2548 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 81162732 is about 9009.0361304637. The cubic root of 81162732 is about 432.9644305472.

The spelling of 81162732 in words is "eighty-one million, one hundred sixty-two thousand, seven hundred thirty-two".