42128556 has 12 divisors (see below), whose sum is σ = 98299992. Its totient is φ = 14042848.

The previous prime is 42128551. The next prime is 42128557. The reversal of 42128556 is 65582124.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (42128551) 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, 1755345 + ... + 1755368.

It is an arithmetic number, because the mean of its divisors is an integer number (8191666).

Almost surely, 2^42128556 is an apocalyptic number.

It is an amenable number.

42128556 is an abundant number, since it is smaller than the sum of its proper divisors (56171436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42128556 is a wasteful number, since it uses less digits than its factorization.

42128556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510720 (or 3510718 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 42128556 is about 6490.6514310969. The cubic root of 42128556 is about 347.9569572871.

The spelling of 42128556 in words is "forty-two million, one hundred twenty-eight thousand, five hundred fifty-six".