82668405 has 8 divisors (see below), whose sum is σ = 132269472. Its totient is φ = 44089808.

The previous prime is 82668401. The next prime is 82668461. The reversal of 82668405 is 50486628.

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 82668405 - 2² = 82668401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82668401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2755599 + ... + 2755628.

It is an arithmetic number, because the mean of its divisors is an integer number (16533684).

Almost surely, 2^82668405 is an apocalyptic number.

It is an amenable number.

82668405 is a deficient number, since it is larger than the sum of its proper divisors (49601067).

82668405 is a wasteful number, since it uses less digits than its factorization.

82668405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5511235.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 82668405 is about 9092.2167264095. The cubic root of 82668405 is about 435.6253919061.

The spelling of 82668405 in words is "eighty-two million, six hundred sixty-eight thousand, four hundred five".