7878351817 has 16 divisors (see below), whose sum is σ = 9044732032. Its totient is φ = 6722248320.

The previous prime is 7878351779. The next prime is 7878351853. The reversal of 7878351817 is 7181538787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7878351817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7878351317) 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, 3685573 + ... + 3687709.

It is an arithmetic number, because the mean of its divisors is an integer number (565295752).

Almost surely, 2^7878351817 is an apocalyptic number.

It is an amenable number.

7878351817 is a deficient number, since it is larger than the sum of its proper divisors (1166380215).

7878351817 is a wasteful number, since it uses less digits than its factorization.

7878351817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288.

The product of its digits is 2634240, while the sum is 55.

The square root of 7878351817 is about 88760.0800867147. The cubic root of 7878351817 is about 1989.8108299764.

The spelling of 7878351817 in words is "seven billion, eight hundred seventy-eight million, three hundred fifty-one thousand, eight hundred seventeen".