42878305 has 8 divisors (see below), whose sum is σ = 51499944. Its totient is φ = 34272000.

The previous prime is 42878299. The next prime is 42878317. The reversal of 42878305 is 50387824.

It can be written as a sum of positive squares in 4 ways, for example, as 1700416 + 41177889 = 1304^2 + 6417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42878305 - 2¹¹ = 42876257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3655 + ... + 9955.

It is an arithmetic number, because the mean of its divisors is an integer number (6437493).

Almost surely, 2^42878305 is an apocalyptic number.

It is an amenable number.

42878305 is a deficient number, since it is larger than the sum of its proper divisors (8621639).

42878305 is a wasteful number, since it uses less digits than its factorization.

42878305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7667.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 42878305 is about 6548.1527929638. The cubic root of 42878305 is about 350.0089929662.

The spelling of 42878305 in words is "forty-two million, eight hundred seventy-eight thousand, three hundred five".