81681082 has 8 divisors (see below), whose sum is σ = 140024736. Its totient is φ = 35006172.

The previous prime is 81681079. The next prime is 81681091. The reversal of 81681082 is 28018618.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2917168 + ... + 2917195.

It is an arithmetic number, because the mean of its divisors is an integer number (17503092).

Almost surely, 2^81681082 is an apocalyptic number.

81681082 is a deficient number, since it is larger than the sum of its proper divisors (58343654).

81681082 is a wasteful number, since it uses less digits than its factorization.

81681082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5834372.

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 81681082 is about 9037.7586823283. The cubic root of 81681082 is about 433.8841918844.

The spelling of 81681082 in words is "eighty-one million, six hundred eighty-one thousand, eighty-two".