7878123868 has 48 divisors (see below), whose sum is σ = 14347726848. Its totient is φ = 3781008000.

The previous prime is 7878123823. The next prime is 7878123889. The reversal of 7878123868 is 8683218787.

It is a happy number.

It is a congruent 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, 10836121 + ... + 10836847.

It is an arithmetic number, because the mean of its divisors is an integer number (298910976).

Almost surely, 2^7878123868 is an apocalyptic number.

It is an amenable number.

7878123868 is a deficient number, since it is larger than the sum of its proper divisors (6469602980).

7878123868 is a wasteful number, since it uses less digits than its factorization.

7878123868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354 (or 1352 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 58.

The square root of 7878123868 is about 88758.7960035511. The cubic root of 7878123868 is about 1989.7916390012.

The spelling of 7878123868 in words is "seven billion, eight hundred seventy-eight million, one hundred twenty-three thousand, eight hundred sixty-eight".