81793671 has 8 divisors (see below), whose sum is σ = 109100544. Its totient is φ = 54507960.

The previous prime is 81793669. The next prime is 81793693. The reversal of 81793671 is 17639718.

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

It is not a de Polignac number, because 81793671 - 2¹ = 81793669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81793471) 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, 10276 + ... + 16406.

It is an arithmetic number, because the mean of its divisors is an integer number (13637568).

Almost surely, 2^81793671 is an apocalyptic number.

81793671 is a deficient number, since it is larger than the sum of its proper divisors (27306873).

81793671 is a wasteful number, since it uses less digits than its factorization.

81793671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10581.

The product of its digits is 63504, while the sum is 42.

The square root of 81793671 is about 9043.9853493911. The cubic root of 81793671 is about 434.0834553209.

The spelling of 81793671 in words is "eighty-one million, seven hundred ninety-three thousand, six hundred seventy-one".