81748165 has 8 divisors (see below), whose sum is σ = 103260960. Its totient is φ = 61956432.

The previous prime is 81748159. The next prime is 81748169. The reversal of 81748165 is 56184718.

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

It is a cyclic number.

It is not a de Polignac number, because 81748165 - 2²³ = 73359557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81748169) 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, 430159 + ... + 430348.

It is an arithmetic number, because the mean of its divisors is an integer number (12907620).

Almost surely, 2^81748165 is an apocalyptic number.

It is an amenable number.

81748165 is a deficient number, since it is larger than the sum of its proper divisors (21512795).

81748165 is a wasteful number, since it uses less digits than its factorization.

81748165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860531.

The product of its digits is 53760, while the sum is 40.

The square root of 81748165 is about 9041.4691837112. The cubic root of 81748165 is about 434.0029394493.

The spelling of 81748165 in words is "eighty-one million, seven hundred forty-eight thousand, one hundred sixty-five".