18087480 has 96 divisors (see below), whose sum is σ = 60091200. Its totient is φ = 4716288.

The previous prime is 18087479. The next prime is 18087481. The reversal of 18087480 is 8478081.

It is an interprime number because it is at equal distance from previous prime (18087479) and next prime (18087481).

It is a super-3 number, since 3×18087480³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18087481) 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, 16386 + ... + 17454.

It is an arithmetic number, because the mean of its divisors is an integer number (625950).

Almost surely, 2^18087480 is an apocalyptic number.

18087480 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 18087480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30045600).

18087480 is an abundant number, since it is smaller than the sum of its proper divisors (42003720).

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

18087480 is a wasteful number, since it uses less digits than its factorization.

18087480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 18087480 is about 4252.9378081510. The cubic root of 18087480 is about 262.4980135904.

The spelling of 18087480 in words is "eighteen million, eighty-seven thousand, four hundred eighty".