42856778 has 4 divisors (see below), whose sum is σ = 64285170. Its totient is φ = 21428388.

The previous prime is 42856777. The next prime is 42856819. The reversal of 42856778 is 87765824.

42856778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 35200489 + 7656289 = 5933^2 + 2767^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42856777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10714193 + ... + 10714196.

Almost surely, 2^42856778 is an apocalyptic number.

42856778 is a deficient number, since it is larger than the sum of its proper divisors (21428392).

42856778 is a wasteful number, since it uses less digits than its factorization.

42856778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21428391.

The product of its digits is 752640, while the sum is 47.

The square root of 42856778 is about 6546.5088405959. The cubic root of 42856778 is about 349.9504093005.

It can be divided in two parts, 42856 and 778, that added together give a palindrome (43634).

The spelling of 42856778 in words is "forty-two million, eight hundred fifty-six thousand, seven hundred seventy-eight".