818912778 has 16 divisors (see below), whose sum is σ = 1639577376. Its totient is φ = 272678960.

The previous prime is 818912761. The next prime is 818912779. The reversal of 818912778 is 877219818.

818912778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 818912778.

It is not an unprimeable number, because it can be changed into a prime (818912779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66876 + ... + 78167.

It is an arithmetic number, because the mean of its divisors is an integer number (102473586).

Almost surely, 2^818912778 is an apocalyptic number.

818912778 is an abundant number, since it is smaller than the sum of its proper divisors (820664598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

818912778 is a wasteful number, since it uses less digits than its factorization.

818912778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145989.

The product of its digits is 451584, while the sum is 51.

The square root of 818912778 is about 28616.6521102661. The cubic root of 818912778 is about 935.5763089892.

The spelling of 818912778 in words is "eight hundred eighteen million, nine hundred twelve thousand, seven hundred seventy-eight".