81705468 has 48 divisors (see below), whose sum is σ = 217395360. Its totient is φ = 23660544.

The previous prime is 81705467. The next prime is 81705473. The reversal of 81705468 is 86450718.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81705467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12753 + ... + 18056.

It is an arithmetic number, because the mean of its divisors is an integer number (4529070).

Almost surely, 2^81705468 is an apocalyptic number.

It is an amenable number.

81705468 is an abundant number, since it is smaller than the sum of its proper divisors (135689892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81705468 is a wasteful number, since it uses less digits than its factorization.

81705468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30846 (or 30844 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 81705468 is about 9039.1076993252. The cubic root of 81705468 is about 433.9273664966.

The spelling of 81705468 in words is "eighty-one million, seven hundred five thousand, four hundred sixty-eight".