81704361 has 8 divisors (see below), whose sum is σ = 110062624. Its totient is φ = 53907840.

The previous prime is 81704353. The next prime is 81704387. The reversal of 81704361 is 16340718.

It is a happy number.

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

It is not a de Polignac number, because 81704361 - 2³ = 81704353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81704341) 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, 140095 + ... + 140676.

It is an arithmetic number, because the mean of its divisors is an integer number (13757828).

Almost surely, 2^81704361 is an apocalyptic number.

It is an amenable number.

81704361 is a deficient number, since it is larger than the sum of its proper divisors (28358263).

81704361 is a wasteful number, since it uses less digits than its factorization.

81704361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280871.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 81704361 is about 9039.0464651975. The cubic root of 81704361 is about 433.9254067756.

The spelling of 81704361 in words is "eighty-one million, seven hundred four thousand, three hundred sixty-one".