18255280 has 80 divisors (see below), whose sum is σ = 46497024. Its totient is φ = 6635520.

The previous prime is 18255277. The next prime is 18255283. The reversal of 18255280 is 8255281.

It is an interprime number because it is at equal distance from previous prime (18255277) and next prime (18255283).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (18255283) 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, 41944 + ... + 42376.

Almost surely, 2^18255280 is an apocalyptic number.

18255280 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 18255280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23248512).

18255280 is an abundant number, since it is smaller than the sum of its proper divisors (28241744).

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

18255280 is a wasteful number, since it uses less digits than its factorization.

18255280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 18255280 is about 4272.6198052249. The cubic root of 18255280 is about 263.3072594312.

Subtracting from 18255280 its reverse (8255281), we obtain a palindrome (9999999).

The spelling of 18255280 in words is "eighteen million, two hundred fifty-five thousand, two hundred eighty".