42808666 has 8 divisors (see below), whose sum is σ = 64302804. Its totient is φ = 21374400.

The previous prime is 42808657. The next prime is 42808673. The reversal of 42808666 is 66680824.

42808666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 40691641 + 2117025 = 6379^2 + 1455^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13135 + ... + 16066.

Almost surely, 2^42808666 is an apocalyptic number.

42808666 is a deficient number, since it is larger than the sum of its proper divisors (21494138).

42808666 is a wasteful number, since it uses less digits than its factorization.

42808666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29936.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 42808666 is about 6542.8331783716. The cubic root of 42808666 is about 349.8194061525.

The spelling of 42808666 in words is "forty-two million, eight hundred eight thousand, six hundred sixty-six".