18071280 has 120 divisors (see below), whose sum is σ = 63931920. Its totient is φ = 4561920.

The previous prime is 18071279. The next prime is 18071297. The reversal of 18071280 is 8217081.

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13020 + ... + 14340.

It is an arithmetic number, because the mean of its divisors is an integer number (532766).

Almost surely, 2^18071280 is an apocalyptic number.

18071280 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 18071280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31965960).

18071280 is an abundant number, since it is smaller than the sum of its proper divisors (45860640).

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

18071280 is a wasteful number, since it uses less digits than its factorization.

18071280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359 (or 1350 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 18071280 is about 4251.0328156814. The cubic root of 18071280 is about 262.4196216489.

It can be divided in two parts, 1 and 8071280, that added together give a square (8071281 = 2841²).

The spelling of 18071280 in words is "eighteen million, seventy-one thousand, two hundred eighty".