42289881138 has 90 divisors (see below), whose sum is σ = 96292219023. Its totient is φ = 13872400200.

The previous prime is 42289881133. The next prime is 42289881143. The reversal of 42289881138 is 83118898224.

42289881138 is a `hidden beast` number, since 422 + 8 + 9 + 8 + 81 + 138 = 666.

It is an interprime number because it is at equal distance from previous prime (42289881133) and next prime (42289881143).

It can be written as a sum of positive squares in only one way, i.e., 21144940569 + 21144940569 = 145413^2 + 145413^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=145413.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (42289881133) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 280065363 + ... + 280065513.

Almost surely, 2^42289881138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42289881138

42289881138 is an abundant number, since it is smaller than the sum of its proper divisors (54002337885).

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

42289881138 is an equidigital number, since it uses as much as digits as its factorization.

42289881138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 263 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 54.

The spelling of 42289881138 in words is "forty-two billion, two hundred eighty-nine million, eight hundred eighty-one thousand, one hundred thirty-eight".