810478664 has 16 divisors (see below), whose sum is σ = 1522640700. Its totient is φ = 404441152.

The previous prime is 810478657. The next prime is 810478667. The reversal of 810478664 is 466874018.

It can be written as a sum of positive squares in 2 ways, for example, as 598193764 + 212284900 = 24458^2 + 14570^2 .

It is not an unprimeable number, because it can be changed into a prime (810478667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95447 + ... + 103590.

Almost surely, 2^810478664 is an apocalyptic number.

It is an amenable number.

810478664 is a deficient number, since it is larger than the sum of its proper divisors (712162036).

810478664 is a wasteful number, since it uses less digits than its factorization.

810478664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199552 (or 199548 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 810478664 is about 28468.9069688318. The cubic root of 810478664 is about 932.3533354235.

It can be divided in two parts, 8104 and 78664, that added together give a palindrome (86768).

The spelling of 810478664 in words is "eight hundred ten million, four hundred seventy-eight thousand, six hundred sixty-four".