42856128390 has 128 divisors (see below), whose sum is σ = 108312422400. Its totient is φ = 10831518720.

The previous prime is 42856128353. The next prime is 42856128391. The reversal of 42856128390 is 9382165824.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42856128391) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51079591 + ... + 51080429.

It is an arithmetic number, because the mean of its divisors is an integer number (846190800).

Almost surely, 2^42856128390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42856128390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54156211200).

42856128390 is an abundant number, since it is smaller than the sum of its proper divisors (65456294010).

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

42856128390 is a wasteful number, since it uses less digits than its factorization.

42856128390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462.

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 42856128390 in words is "forty-two billion, eight hundred fifty-six million, one hundred twenty-eight thousand, three hundred ninety".