8785921778 has 4 divisors (see below), whose sum is σ = 13178882670. Its totient is φ = 4392960888.

The previous prime is 8785921763. The next prime is 8785921817. The reversal of 8785921778 is 8771295878.

8785921778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8771295878 = 2 ⋅4385647939.

It can be written as a sum of positive squares in only one way, i.e., 6456604609 + 2329317169 = 80353^2 + 48263^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8785921778.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2196480443 + ... + 2196480446.

Almost surely, 2^8785921778 is an apocalyptic number.

8785921778 is a deficient number, since it is larger than the sum of its proper divisors (4392960892).

8785921778 is a wasteful number, since it uses less digits than its factorization.

8785921778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4392960891.

The product of its digits is 15805440, while the sum is 62.

The square root of 8785921778 is about 93733.2479859735. The cubic root of 8785921778 is about 2063.4586835412.

The spelling of 8785921778 in words is "eight billion, seven hundred eighty-five million, nine hundred twenty-one thousand, seven hundred seventy-eight".