42128663 has 4 divisors (see below), whose sum is σ = 43960368. Its totient is φ = 40296960.

The previous prime is 42128657. The next prime is 42128699. The reversal of 42128663 is 36682124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42128663 - 2¹⁰ = 42127639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42128633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915818 + ... + 915863.

It is an arithmetic number, because the mean of its divisors is an integer number (10990092).

Almost surely, 2^42128663 is an apocalyptic number.

42128663 is a deficient number, since it is larger than the sum of its proper divisors (1831705).

42128663 is a wasteful number, since it uses less digits than its factorization.

42128663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831704.

The product of its digits is 13824, while the sum is 32.

The square root of 42128663 is about 6490.6596737158. The cubic root of 42128663 is about 347.9572518724.

The spelling of 42128663 in words is "forty-two million, one hundred twenty-eight thousand, six hundred sixty-three".