7878123867 has 16 divisors (see below), whose sum is σ = 11138631840. Its totient is φ = 4935770112.

The previous prime is 7878123823. The next prime is 7878123889. The reversal of 7878123867 is 7683218787.

It is not a de Polignac number, because 7878123867 - 2¹⁵ = 7878091099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7878123067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80442 + ... + 149087.

It is an arithmetic number, because the mean of its divisors is an integer number (696164490).

Almost surely, 2^7878123867 is an apocalyptic number.

7878123867 is a deficient number, since it is larger than the sum of its proper divisors (3260507973).

7878123867 is a wasteful number, since it uses less digits than its factorization.

7878123867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230222.

The product of its digits is 6322176, while the sum is 57.

The square root of 7878123867 is about 88758.7959979179. The cubic root of 7878123867 is about 1989.7916389170.

The spelling of 7878123867 in words is "seven billion, eight hundred seventy-eight million, one hundred twenty-three thousand, eight hundred sixty-seven".