42778346 has 16 divisors (see below), whose sum is σ = 69237504. Its totient is φ = 19705584.

The previous prime is 42778303. The next prime is 42778349. The reversal of 42778346 is 64387724.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42778349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15551 + ... + 18093.

It is an arithmetic number, because the mean of its divisors is an integer number (4327344).

Almost surely, 2^42778346 is an apocalyptic number.

42778346 is a deficient number, since it is larger than the sum of its proper divisors (26459158).

42778346 is a wasteful number, since it uses less digits than its factorization.

42778346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205.

The product of its digits is 225792, while the sum is 41.

The square root of 42778346 is about 6540.5157289009. The cubic root of 42778346 is about 349.7367980386.

The spelling of 42778346 in words is "forty-two million, seven hundred seventy-eight thousand, three hundred forty-six".