81896339 has 8 divisors (see below), whose sum is σ = 93650688. Its totient is φ = 70155720.

The previous prime is 81896333. The next prime is 81896341. The reversal of 81896339 is 93369818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81896339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81896293 and 81896302.

It is not an unprimeable number, because it can be changed into a prime (81896333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20474 + ... + 24144.

It is an arithmetic number, because the mean of its divisors is an integer number (11706336).

Almost surely, 2^81896339 is an apocalyptic number.

81896339 is a deficient number, since it is larger than the sum of its proper divisors (11754349).

81896339 is a wasteful number, since it uses less digits than its factorization.

81896339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6865.

The product of its digits is 279936, while the sum is 47.

The square root of 81896339 is about 9049.6596068581. The cubic root of 81896339 is about 434.2650009340.

The spelling of 81896339 in words is "eighty-one million, eight hundred ninety-six thousand, three hundred thirty-nine".