18320256 has 192 divisors, whose sum is σ = 59404800. Its totient is φ = 5598720.

The previous prime is 18320251. The next prime is 18320261. The reversal of 18320256 is 65202381.

It is an interprime number because it is at equal distance from previous prime (18320251) and next prime (18320261).

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18320251) 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, 590961 + ... + 590991.

It is an arithmetic number, because the mean of its divisors is an integer number (309400).

Almost surely, 2^18320256 is an apocalyptic number.

18320256 is a gapful number since it is divisible by the number (16) 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 18320256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29702400).

18320256 is an abundant number, since it is smaller than the sum of its proper divisors (41084544).

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

18320256 is an equidigital number, since it uses as much as digits as its factorization.

18320256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 18320256 is about 4280.2168169381. The cubic root of 18320256 is about 263.6192859474.

The spelling of 18320256 in words is "eighteen million, three hundred twenty thousand, two hundred fifty-six".