42878705 has 4 divisors (see below), whose sum is σ = 51454452. Its totient is φ = 34302960.

The previous prime is 42878701. The next prime is 42878707. The reversal of 42878705 is 50787824.

42878705 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 2 ways, for example, as 15745024 + 27133681 = 3968^2 + 5209^2 .

It is not a de Polignac number, because 42878705 - 2² = 42878701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42878701) 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 in 3 ways as a sum of consecutive naturals, for example, 4287866 + ... + 4287875.

It is an arithmetic number, because the mean of its divisors is an integer number (12863613).

Almost surely, 2^42878705 is an apocalyptic number.

It is an amenable number.

42878705 is a deficient number, since it is larger than the sum of its proper divisors (8575747).

42878705 is an equidigital number, since it uses as much as digits as its factorization.

42878705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8575746.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 42878705 is about 6548.1833358574. The cubic root of 42878705 is about 350.0100813423.

The spelling of 42878705 in words is "forty-two million, eight hundred seventy-eight thousand, seven hundred five".