42778244 has 6 divisors (see below), whose sum is σ = 74861934. Its totient is φ = 21389120.

The previous prime is 42778243. The next prime is 42778271. The reversal of 42778244 is 44287724.

It can be written as a sum of positive squares in only one way, i.e., 42406144 + 372100 = 6512^2 + 610^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42778198 and 42778207.

It is not an unprimeable number, because it can be changed into a prime (42778243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5347277 + ... + 5347284.

It is an arithmetic number, because the mean of its divisors is an integer number (12476989).

Almost surely, 2^42778244 is an apocalyptic number.

It is an amenable number.

42778244 is a deficient number, since it is larger than the sum of its proper divisors (32083690).

42778244 is a wasteful number, since it uses less digits than its factorization.

42778244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10694565 (or 10694563 counting only the distinct ones).

The product of its digits is 100352, while the sum is 38.

The square root of 42778244 is about 6540.5079313460. The cubic root of 42778244 is about 349.7365200695.

It can be divided in two parts, 4277 and 8244, that added together give a palindrome (12521).

The spelling of 42778244 in words is "forty-two million, seven hundred seventy-eight thousand, two hundred forty-four".