8107978 has 4 divisors (see below), whose sum is σ = 12161970. Its totient is φ = 4053988.

The previous prime is 8107973. The next prime is 8107999. The reversal of 8107978 is 8797018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5745609 + 2362369 = 2397^2 + 1537^2 .

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 8107978.

It is not an unprimeable number, because it can be changed into a prime (8107973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2026993 + ... + 2026996.

Almost surely, 2^8107978 is an apocalyptic number.

8107978 is a deficient number, since it is larger than the sum of its proper divisors (4053992).

8107978 is a wasteful number, since it uses less digits than its factorization.

8107978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053991.

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

The square root of 8107978 is about 2847.4511409329. The cubic root of 8107978 is about 200.8957984025.

Adding to 8107978 its sum of digits (40), we get a palindrome (8108018).

The spelling of 8107978 in words is "eight million, one hundred seven thousand, nine hundred seventy-eight".