7878123869 has 32 divisors (see below), whose sum is σ = 10080930816. Its totient is φ = 5977883520.

The previous prime is 7878123823. The next prime is 7878123889. The reversal of 7878123869 is 9683218787.

It is not a de Polignac number, because 7878123869 - 2⁸ = 7878123613 is a prime.

It is a super-2 number, since 2×7878123869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878123809) 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 31 ways as a sum of consecutive naturals, for example, 1145489 + ... + 1152345.

It is an arithmetic number, because the mean of its divisors is an integer number (315029088).

Almost surely, 2^7878123869 is an apocalyptic number.

It is an amenable number.

7878123869 is a deficient number, since it is larger than the sum of its proper divisors (2202806947).

7878123869 is a wasteful number, since it uses less digits than its factorization.

7878123869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7265.

The product of its digits is 8128512, while the sum is 59.

The square root of 7878123869 is about 88758.7960091844. The cubic root of 7878123869 is about 1989.7916390854.

The spelling of 7878123869 in words is "seven billion, eight hundred seventy-eight million, one hundred twenty-three thousand, eight hundred sixty-nine".