818489664 has 112 divisors (see below), whose sum is σ = 2416698240. Its totient is φ = 271641600.

The previous prime is 818489663. The next prime is 818489669. The reversal of 818489664 is 466984818.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 818489664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818489663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453564 + ... + 455364.

Almost surely, 2^818489664 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 818489664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1208349120).

818489664 is an abundant number, since it is smaller than the sum of its proper divisors (1598208576).

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

818489664 is a wasteful number, since it uses less digits than its factorization.

818489664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085 (or 2069 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The square root of 818489664 is about 28609.2583615864. The cubic root of 818489664 is about 935.4151507473.

The spelling of 818489664 in words is "eight hundred eighteen million, four hundred eighty-nine thousand, six hundred sixty-four".