81367984 has 20 divisors (see below), whose sum is σ = 166924584. Its totient is φ = 38290688.

The previous prime is 81367981. The next prime is 81367987. The reversal of 81367984 is 48976318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81367981) and next prime (81367987).

It is not an unprimeable number, because it can be changed into a prime (81367981) 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, 149302 + ... + 149845.

Almost surely, 2^81367984 is an apocalyptic number.

It is an amenable number.

81367984 is an abundant number, since it is smaller than the sum of its proper divisors (85556600).

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

81367984 is a wasteful number, since it uses less digits than its factorization.

81367984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299172 (or 299166 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 81367984 is about 9020.4203893167. The cubic root of 81367984 is about 433.3290971315.

The spelling of 81367984 in words is "eighty-one million, three hundred sixty-seven thousand, nine hundred eighty-four".