81443996 has 12 divisors (see below), whose sum is σ = 143484600. Its totient is φ = 40448400.

The previous prime is 81443969. The next prime is 81444001. The reversal of 81443996 is 69934418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67730 + ... + 68921.

It is an arithmetic number, because the mean of its divisors is an integer number (11957050).

Almost surely, 2^81443996 is an apocalyptic number.

It is an amenable number.

81443996 is a deficient number, since it is larger than the sum of its proper divisors (62040604).

81443996 is a wasteful number, since it uses less digits than its factorization.

81443996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136804 (or 136802 counting only the distinct ones).

The product of its digits is 186624, while the sum is 44.

The square root of 81443996 is about 9024.6327349095. The cubic root of 81443996 is about 433.4639903181.

The spelling of 81443996 in words is "eighty-one million, four hundred forty-three thousand, nine hundred ninety-six".