18065280 has 96 divisors (see below), whose sum is σ = 58182840. Its totient is φ = 4767744.

The previous prime is 18065263. The next prime is 18065291. The reversal of 18065280 is 8256081.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186192 + ... + 186288.

Almost surely, 2^18065280 is an apocalyptic number.

18065280 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 18065280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29091420).

18065280 is an abundant number, since it is smaller than the sum of its proper divisors (40117560).

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

18065280 is an frugal number, since it uses more digits than its factorization.

18065280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18065280 is about 4250.3270462401. The cubic root of 18065280 is about 262.3905757075.

Multiplying 18065280 by its sum of digits (30), we get a square (541958400 = 23280²).

18065280 divided by its sum of digits (30) gives a square (602176 = 776²).

The spelling of 18065280 in words is "eighteen million, sixty-five thousand, two hundred eighty".