81589996 has 12 divisors (see below), whose sum is σ = 144503352. Its totient is φ = 40303328.

The previous prime is 81589969. The next prime is 81590011. The reversal of 81589996 is 69998518.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122545 + ... + 123208.

It is an arithmetic number, because the mean of its divisors is an integer number (12041946).

Almost surely, 2^81589996 is an apocalyptic number.

It is an amenable number.

81589996 is a deficient number, since it is larger than the sum of its proper divisors (62913356).

81589996 is a wasteful number, since it uses less digits than its factorization.

81589996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245840 (or 245838 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 55.

The square root of 81589996 is about 9032.7180848292. The cubic root of 81589996 is about 433.7228510775.

The spelling of 81589996 in words is "eighty-one million, five hundred eighty-nine thousand, nine hundred ninety-six".