7878748478787 has 12 divisors (see below), whose sum is σ = 11645075271544. Its totient is φ = 5130347846400.

The previous prime is 7878748478749. The next prime is 7878748478789.

7878748478787 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7878748478787 - 2¹⁰ = 7878748477763 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7878748478697 and 7878748478706.

It is not an unprimeable number, because it can be changed into a prime (7878748478789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10179261214 + ... + 10179261987.

Almost surely, 2^{7878748478787} is an apocalyptic number.

7878748478787 is a deficient number, since it is larger than the sum of its proper divisors (3766326792757).

7878748478787 is a wasteful number, since it uses less digits than its factorization.

7878748478787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20358523250 (or 20358523247 counting only the distinct ones).

The product of its digits is 61681958912, while the sum is 90.

The spelling of 7878748478787 in words is "seven trillion, eight hundred seventy-eight billion, seven hundred forty-eight million, four hundred seventy-eight thousand, seven hundred eighty-seven".