81668482 has 8 divisors (see below), whose sum is σ = 140003136. Its totient is φ = 35000772.

The previous prime is 81668453. The next prime is 81668491. The reversal of 81668482 is 28486618.

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, 2916718 + ... + 2916745.

It is an arithmetic number, because the mean of its divisors is an integer number (17500392).

Almost surely, 2^81668482 is an apocalyptic number.

81668482 is a deficient number, since it is larger than the sum of its proper divisors (58334654).

81668482 is a wasteful number, since it uses less digits than its factorization.

81668482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5833472.

The product of its digits is 147456, while the sum is 43.

The square root of 81668482 is about 9037.0615799606. The cubic root of 81668482 is about 433.8618806311.

The spelling of 81668482 in words is "eighty-one million, six hundred sixty-eight thousand, four hundred eighty-two".