810818664 has 64 divisors (see below), whose sum is σ = 2088504000. Its totient is φ = 262166016.

The previous prime is 810818663. The next prime is 810818677. The reversal of 810818664 is 466818018.

It is not an unprimeable number, because it can be changed into a prime (810818663) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 151132 + ... + 156404.

It is an arithmetic number, because the mean of its divisors is an integer number (32632875).

Almost surely, 2^810818664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 810818664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1044252000).

810818664 is an abundant number, since it is smaller than the sum of its proper divisors (1277685336).

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

810818664 is a wasteful number, since it uses less digits than its factorization.

810818664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474 (or 5470 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 810818664 is about 28474.8777697113. The cubic root of 810818664 is about 932.4836928821.

The spelling of 810818664 in words is "eight hundred ten million, eight hundred eighteen thousand, six hundred sixty-four".