8663978 has 4 divisors (see below), whose sum is σ = 12995970. Its totient is φ = 4331988.

The previous prime is 8663969. The next prime is 8663987. The reversal of 8663978 is 8793668.

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

It is an interprime number because it is at equal distance from previous prime (8663969) and next prime (8663987).

It can be written as a sum of positive squares in only one way, i.e., 5230369 + 3433609 = 2287^2 + 1853^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2165993 + ... + 2165996.

Almost surely, 2^8663978 is an apocalyptic number.

8663978 is a deficient number, since it is larger than the sum of its proper divisors (4331992).

8663978 is a wasteful number, since it uses less digits than its factorization.

8663978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4331991.

The product of its digits is 435456, while the sum is 47.

The square root of 8663978 is about 2943.4636060261. The cubic root of 8663978 is about 205.3867614336.

The spelling of 8663978 in words is "eight million, six hundred sixty-three thousand, nine hundred seventy-eight".