28378342242 has 24 divisors (see below), whose sum is σ = 62177270220. Its totient is φ = 9353160960.

The previous prime is 28378342193. The next prime is 28378342247. The reversal of 28378342242 is 24224387382.

28378342242 is a `hidden beast` number, since 2 + 8 + 378 + 34 + 2 + 242 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23503649481 + 4874692761 = 153309^2 + 69819^2 .

It is not an unprimeable number, because it can be changed into a prime (28378342247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8855559 + ... + 8858762.

Almost surely, 2^28378342242 is an apocalyptic number.

28378342242 is an abundant number, since it is smaller than the sum of its proper divisors (33798927978).

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

28378342242 is a wasteful number, since it uses less digits than its factorization.

28378342242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17714418 (or 17714415 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 45.

The spelling of 28378342242 in words is "twenty-eight billion, three hundred seventy-eight million, three hundred forty-two thousand, two hundred forty-two".