81883447 has 8 divisors (see below), whose sum is σ = 84877056. Its totient is φ = 78942072.

The previous prime is 81883433. The next prime is 81883453. The reversal of 81883447 is 74438818.

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-81883447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81883547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9853 + ... + 16150.

It is an arithmetic number, because the mean of its divisors is an integer number (10609632).

Almost surely, 2^81883447 is an apocalyptic number.

81883447 is a deficient number, since it is larger than the sum of its proper divisors (2993609).

81883447 is a wasteful number, since it uses less digits than its factorization.

81883447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26117.

The product of its digits is 172032, while the sum is 43.

The square root of 81883447 is about 9048.9472868395. The cubic root of 81883447 is about 434.2422126212.

The spelling of 81883447 in words is "eighty-one million, eight hundred eighty-three thousand, four hundred forty-seven".