8668390778 has 8 divisors (see below), whose sum is σ = 13003351200. Its totient is φ = 4333940380.

The previous prime is 8668390777. The next prime is 8668390807. The reversal of 8668390778 is 8770938668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 8668390778.

It is not an unprimeable number, because it can be changed into a prime (8668390777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81728 + ... + 154971.

It is an arithmetic number, because the mean of its divisors is an integer number (1625418900).

Almost surely, 2^8668390778 is an apocalyptic number.

8668390778 is a deficient number, since it is larger than the sum of its proper divisors (4334960422).

8668390778 is a wasteful number, since it uses less digits than its factorization.

8668390778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255012.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The square root of 8668390778 is about 93104.1931279145. The cubic root of 8668390778 is about 2054.2162503219.

The spelling of 8668390778 in words is "eight billion, six hundred sixty-eight million, three hundred ninety thousand, seven hundred seventy-eight".