81190984 has 32 divisors (see below), whose sum is σ = 179596800. Its totient is φ = 33672960.

The previous prime is 81190969. The next prime is 81191003. The reversal of 81190984 is 48909118.

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 7 ways as a sum of consecutive naturals, for example, 21649 + ... + 25120.

It is an arithmetic number, because the mean of its divisors is an integer number (5612400).

Almost surely, 2^81190984 is an apocalyptic number.

It is an amenable number.

81190984 is an abundant number, since it is smaller than the sum of its proper divisors (98405816).

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

81190984 is a wasteful number, since it uses less digits than its factorization.

81190984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46813 (or 46809 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 81190984 is about 9010.6039753171. The cubic root of 81190984 is about 433.0146616971.

The spelling of 81190984 in words is "eighty-one million, one hundred ninety thousand, nine hundred eighty-four".