42778363 has 4 divisors (see below), whose sum is σ = 43503480. Its totient is φ = 42053248.

The previous prime is 42778349. The next prime is 42778369. The reversal of 42778363 is 36387724.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42778363 - 2²⁵ = 9223931 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42778369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362470 + ... + 362587.

It is an arithmetic number, because the mean of its divisors is an integer number (10875870).

Almost surely, 2^42778363 is an apocalyptic number.

42778363 is a deficient number, since it is larger than the sum of its proper divisors (725117).

42778363 is an equidigital number, since it uses as much as digits as its factorization.

42778363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725116.

The product of its digits is 169344, while the sum is 40.

The square root of 42778363 is about 6540.5170284925. The cubic root of 42778363 is about 349.7368443668.

The spelling of 42778363 in words is "forty-two million, seven hundred seventy-eight thousand, three hundred sixty-three".