42066664 has 8 divisors (see below), whose sum is σ = 78875010. Its totient is φ = 21033328.

The previous prime is 42066643. The next prime is 42066671. The reversal of 42066664 is 46666024.

It can be written as a sum of positive squares in only one way, i.e., 21436900 + 20629764 = 4630^2 + 4542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629159 + ... + 2629174.

Almost surely, 2^42066664 is an apocalyptic number.

It is an amenable number.

42066664 is a deficient number, since it is larger than the sum of its proper divisors (36808346).

42066664 is a wasteful number, since it uses less digits than its factorization.

42066664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5258339 (or 5258335 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 42066664 is about 6485.8818984006. The cubic root of 42066664 is about 347.7864766687.

The spelling of 42066664 in words is "forty-two million, sixty-six thousand, six hundred sixty-four".