18844262640 has 480 divisors, whose sum is σ = 77252198400. Its totient is φ = 4023613440.

The previous prime is 18844262581. The next prime is 18844262659. The reversal of 18844262640 is 4626244881.

18844262640 is a `hidden beast` number, since 18 + 8 + 4 + 4 + 2 + 626 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4528881 + ... + 4533039.

It is an arithmetic number, because the mean of its divisors is an integer number (160942080).

Almost surely, 2^18844262640 is an apocalyptic number.

18844262640 is a gapful number since it is divisible by the number (10) 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 18844262640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38626099200).

18844262640 is an abundant number, since it is smaller than the sum of its proper divisors (58407935760).

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

18844262640 is a wasteful number, since it uses less digits than its factorization.

18844262640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245 (or 4236 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 45.

The spelling of 18844262640 in words is "eighteen billion, eight hundred forty-four million, two hundred sixty-two thousand, six hundred forty".