8109778 has 4 divisors (see below), whose sum is σ = 12164670. Its totient is φ = 4054888.

The previous prime is 8109749. The next prime is 8109779. The reversal of 8109778 is 8779018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8779018 = 2 ⋅4389509.

It can be written as a sum of positive squares in only one way, i.e., 6589489 + 1520289 = 2567^2 + 1233^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 8109778.

It is not an unprimeable number, because it can be changed into a prime (8109779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2027443 + ... + 2027446.

Almost surely, 2^8109778 is an apocalyptic number.

8109778 is a deficient number, since it is larger than the sum of its proper divisors (4054892).

8109778 is a wasteful number, since it uses less digits than its factorization.

8109778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4054891.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 8109778 is about 2847.7671955411. The cubic root of 8109778 is about 200.9106638301.

The spelling of 8109778 in words is "eight million, one hundred nine thousand, seven hundred seventy-eight".