42878786209 has 16 divisors (see below), whose sum is σ = 49686735232. Its totient is φ = 36241665408.

The previous prime is 42878786201. The next prime is 42878786227. The reversal of 42878786209 is 90268787824.

It is a cyclic number.

It is not a de Polignac number, because 42878786209 - 2³ = 42878786201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42878786201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3741442 + ... + 3752884.

It is an arithmetic number, because the mean of its divisors is an integer number (3105420952).

Almost surely, 2^42878786209 is an apocalyptic number.

It is an amenable number.

42878786209 is a deficient number, since it is larger than the sum of its proper divisors (6807949023).

42878786209 is a wasteful number, since it uses less digits than its factorization.

42878786209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18856.

The product of its (nonzero) digits is 21676032, while the sum is 61.

The spelling of 42878786209 in words is "forty-two billion, eight hundred seventy-eight million, seven hundred eighty-six thousand, two hundred nine".