42645668 has 12 divisors (see below), whose sum is σ = 80370780. Its totient is φ = 19682592.

The previous prime is 42645661. The next prime is 42645683. The reversal of 42645668 is 86654624.

It can be written as a sum of positive squares in 2 ways, for example, as 9375844 + 33269824 = 3062^2 + 5768^2 .

It is not an unprimeable number, because it can be changed into a prime (42645661) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 410003 + ... + 410106.

It is an arithmetic number, because the mean of its divisors is an integer number (6697565).

Almost surely, 2^42645668 is an apocalyptic number.

It is an amenable number.

42645668 is a deficient number, since it is larger than the sum of its proper divisors (37725112).

42645668 is a wasteful number, since it uses less digits than its factorization.

42645668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820126 (or 820124 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The square root of 42645668 is about 6530.3650740215. The cubic root of 42645668 is about 349.3748514096.

The spelling of 42645668 in words is "forty-two million, six hundred forty-five thousand, six hundred sixty-eight".