18561480 has 128 divisors (see below), whose sum is σ = 67046400. Its totient is φ = 4015872.

The previous prime is 18561443. The next prime is 18561503. The reversal of 18561480 is 8416581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15379 + ... + 16541.

It is an arithmetic number, because the mean of its divisors is an integer number (523800).

Almost surely, 2^18561480 is an apocalyptic number.

18561480 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 18561480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33523200).

18561480 is an abundant number, since it is smaller than the sum of its proper divisors (48484920).

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

18561480 is a wasteful number, since it uses less digits than its factorization.

18561480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 1199 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 18561480 is about 4308.3036104713. The cubic root of 18561480 is about 264.7712752892.

The spelling of 18561480 in words is "eighteen million, five hundred sixty-one thousand, four hundred eighty".