818128964 has 6 divisors (see below), whose sum is σ = 1431725694. Its totient is φ = 409064480.

The previous prime is 818128951. The next prime is 818128973. The reversal of 818128964 is 469821818.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 784000000 + 34128964 = 28000^2 + 5842^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102266117 + ... + 102266124.

It is an arithmetic number, because the mean of its divisors is an integer number (238620949).

Almost surely, 2^818128964 is an apocalyptic number.

It is an amenable number.

818128964 is a deficient number, since it is larger than the sum of its proper divisors (613596730).

818128964 is a wasteful number, since it uses less digits than its factorization.

818128964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204532245 (or 204532243 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 818128964 is about 28602.9537635539. The cubic root of 818128964 is about 935.2777212699.

The spelling of 818128964 in words is "eight hundred eighteen million, one hundred twenty-eight thousand, nine hundred sixty-four".