81934984 has 16 divisors (see below), whose sum is σ = 158584320. Its totient is φ = 39645840.

The previous prime is 81934967. The next prime is 81934987. The reversal of 81934984 is 48943918.

It is not an unprimeable number, because it can be changed into a prime (81934987) 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 3 ways as a sum of consecutive naturals, for example, 164944 + ... + 165439.

It is an arithmetic number, because the mean of its divisors is an integer number (9911520).

Almost surely, 2^81934984 is an apocalyptic number.

It is an amenable number.

81934984 is a deficient number, since it is larger than the sum of its proper divisors (76649336).

81934984 is a wasteful number, since it uses less digits than its factorization.

81934984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330420 (or 330416 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 81934984 is about 9051.7945182157. The cubic root of 81934984 is about 434.3332967502. Note that the first 3 decimals are identical.

The spelling of 81934984 in words is "eighty-one million, nine hundred thirty-four thousand, nine hundred eighty-four".