81893350287 has 36 divisors (see below), whose sum is σ = 142041946176. Its totient is φ = 45286637760.

The previous prime is 81893350247. The next prime is 81893350303. The reversal of 81893350287 is 78205339818.

81893350287 is a `hidden beast` number, since 8 + 1 + 8 + 9 + 3 + 350 + 287 = 666.

It is not a de Polignac number, because 81893350287 - 2⁶ = 81893350223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81893350237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2981478 + ... + 3008819.

It is an arithmetic number, because the mean of its divisors is an integer number (3945609616).

Almost surely, 2^81893350287 is an apocalyptic number.

81893350287 is a deficient number, since it is larger than the sum of its proper divisors (60148595889).

81893350287 is a wasteful number, since it uses less digits than its factorization.

81893350287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5990348 (or 5990338 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 81893350287 in words is "eighty-one billion, eight hundred ninety-three million, three hundred fifty thousand, two hundred eighty-seven".