81327284893 has 8 divisors (see below), whose sum is σ = 84079328256. Its totient is φ = 78583278000.

The previous prime is 81327284887. The next prime is 81327284917. The reversal of 81327284893 is 39848272318.

It is a happy number.

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-81327284893 is a prime.

It is a super-2 number, since 2×81327284893² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81327284293) 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, 1988533 + ... + 2029018.

It is an arithmetic number, because the mean of its divisors is an integer number (10509916032).

Almost surely, 2^81327284893 is an apocalyptic number.

It is an amenable number.

81327284893 is a deficient number, since it is larger than the sum of its proper divisors (2752043363).

81327284893 is a wasteful number, since it uses less digits than its factorization.

81327284893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018235.

The product of its digits is 4644864, while the sum is 55.

The spelling of 81327284893 in words is "eighty-one billion, three hundred twenty-seven million, two hundred eighty-four thousand, eight hundred ninety-three".