18272880 has 120 divisors (see below), whose sum is σ = 62964720. Its totient is φ = 4746240.

The previous prime is 18272873. The next prime is 18272939. The reversal of 18272880 is 8827281.

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

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 29211 + ... + 29829.

It is an arithmetic number, because the mean of its divisors is an integer number (524706).

Almost surely, 2^18272880 is an apocalyptic number.

18272880 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 18272880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31482360).

18272880 is an abundant number, since it is smaller than the sum of its proper divisors (44691840).

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

18272880 is a wasteful number, since it uses less digits than its factorization.

18272880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679 (or 670 counting only the distinct ones).

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

The square root of 18272880 is about 4274.6789353120. The cubic root of 18272880 is about 263.3918508349.

The spelling of 18272880 in words is "eighteen million, two hundred seventy-two thousand, eight hundred eighty".