18289486964 has 72 divisors (see below), whose sum is σ = 37727955720. Its totient is φ = 7734472704.

The previous prime is 18289486949. The next prime is 18289486967. The reversal of 18289486964 is 46968498281.

It can be written as a sum of positive squares in 4 ways, for example, as 2225952400 + 16063534564 = 47180^2 + 126742^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18289486964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18289486967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7394432 + ... + 7396904.

It is an arithmetic number, because the mean of its divisors is an integer number (523999385).

Almost surely, 2^18289486964 is an apocalyptic number.

18289486964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18289486964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18863977860).

18289486964 is an abundant number, since it is smaller than the sum of its proper divisors (19438468756).

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

18289486964 is a wasteful number, since it uses less digits than its factorization.

18289486964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977 (or 2968 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 65.

The spelling of 18289486964 in words is "eighteen billion, two hundred eighty-nine million, four hundred eighty-six thousand, nine hundred sixty-four".