42128605 has 16 divisors (see below), whose sum is σ = 54457920. Its totient is φ = 31183488.

The previous prime is 42128579. The next prime is 42128621. The reversal of 42128605 is 50682124.

42128605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42128605 - 2⁷ = 42128477 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1072 + ... + 9241.

It is an arithmetic number, because the mean of its divisors is an integer number (3403620).

Almost surely, 2^42128605 is an apocalyptic number.

It is an amenable number.

42128605 is a deficient number, since it is larger than the sum of its proper divisors (12329315).

42128605 is a wasteful number, since it uses less digits than its factorization.

42128605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10380.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 42128605 is about 6490.6552057554. The cubic root of 42128605 is about 347.9570921907.

The spelling of 42128605 in words is "forty-two million, one hundred twenty-eight thousand, six hundred five".