42778438344 has 72 divisors (see below), whose sum is σ = 119716387830. Its totient is φ = 13799473920.

The previous prime is 42778438273. The next prime is 42778438349. The reversal of 42778438344 is 44383487724.

It can be written as a sum of positive squares in only one way, i.e., 30115437444 + 12663000900 = 173538^2 + 112530^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (42778438349) 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 17 ways as a sum of consecutive naturals, for example, 239937 + ... + 378320.

Almost surely, 2^42778438344 is an apocalyptic number.

It is an amenable number.

42778438344 is an abundant number, since it is smaller than the sum of its proper divisors (76937949486).

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

42778438344 is a wasteful number, since it uses less digits than its factorization.

42778438344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618331 (or 618293 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 54.

The spelling of 42778438344 in words is "forty-two billion, seven hundred seventy-eight million, four hundred thirty-eight thousand, three hundred forty-four".