81896744 has 16 divisors (see below), whose sum is σ = 160233120. Its totient is φ = 39167920.

The previous prime is 81896743. The next prime is 81896777. The reversal of 81896744 is 44769818.

It is not an unprimeable number, because it can be changed into a prime (81896741) 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, 222362 + ... + 222729.

It is an arithmetic number, because the mean of its divisors is an integer number (10014570).

Almost surely, 2^81896744 is an apocalyptic number.

It is an amenable number.

81896744 is a deficient number, since it is larger than the sum of its proper divisors (78336376).

81896744 is a wasteful number, since it uses less digits than its factorization.

81896744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445120 (or 445116 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 81896744 is about 9049.6819833627. The cubic root of 81896744 is about 434.2657167863.

The spelling of 81896744 in words is "eighty-one million, eight hundred ninety-six thousand, seven hundred forty-four".