42665128 has 32 divisors (see below), whose sum is σ = 87959520. Its totient is φ = 19240000.

The previous prime is 42665113. The next prime is 42665137. The reversal of 42665128 is 82156624.

It is a junction number, because it is equal to n+sod(n) for n = 42665093 and 42665102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9678 + ... + 13378.

It is an arithmetic number, because the mean of its divisors is an integer number (2748735).

Almost surely, 2^42665128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42665128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43979760).

42665128 is an abundant number, since it is smaller than the sum of its proper divisors (45294392).

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

42665128 is a wasteful number, since it uses less digits than its factorization.

42665128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849 (or 3845 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 42665128 is about 6531.8548667281. The cubic root of 42665128 is about 349.4279853780.

The spelling of 42665128 in words is "forty-two million, six hundred sixty-five thousand, one hundred twenty-eight".