81162384 has 20 divisors (see below), whose sum is σ = 209669616. Its totient is φ = 27054112.

The previous prime is 81162317. The next prime is 81162407. The reversal of 81162384 is 48326118.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 845394 + ... + 845489.

Almost surely, 2^81162384 is an apocalyptic number.

It is an amenable number.

81162384 is an abundant number, since it is smaller than the sum of its proper divisors (128507232).

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

81162384 is a wasteful number, since it uses less digits than its factorization.

81162384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690894 (or 1690888 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 81162384 is about 9009.0168165011. The cubic root of 81162384 is about 432.9638117416.

The spelling of 81162384 in words is "eighty-one million, one hundred sixty-two thousand, three hundred eighty-four".