7878942785 has 16 divisors (see below), whose sum is σ = 10822139136. Its totient is φ = 5394337728.

The previous prime is 7878942739. The next prime is 7878942809. The reversal of 7878942785 is 5872498787.

It is a cyclic number.

It is not a de Polignac number, because 7878942785 - 2¹⁶ = 7878877249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151322 + ... + 196611.

It is an arithmetic number, because the mean of its divisors is an integer number (676383696).

Almost surely, 2^7878942785 is an apocalyptic number.

It is an amenable number.

7878942785 is a deficient number, since it is larger than the sum of its proper divisors (2943196351).

7878942785 is a wasteful number, since it uses less digits than its factorization.

7878942785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348592.

The product of its digits is 63221760, while the sum is 65.

The square root of 7878942785 is about 88763.4090433665. The cubic root of 7878942785 is about 1989.8605817160.

The spelling of 7878942785 in words is "seven billion, eight hundred seventy-eight million, nine hundred forty-two thousand, seven hundred eighty-five".