18273680 has 20 divisors (see below), whose sum is σ = 42486492. Its totient is φ = 7309440.

The previous prime is 18273679. The next prime is 18273719. The reversal of 18273680 is 8637281.

It can be written as a sum of positive squares in 2 ways, for example, as 8737936 + 9535744 = 2956^2 + 3088^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 18273680.

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 3 ways as a sum of consecutive naturals, for example, 114131 + ... + 114290.

Almost surely, 2^18273680 is an apocalyptic number.

18273680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18273680 is an abundant number, since it is smaller than the sum of its proper divisors (24212812).

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

18273680 is a wasteful number, since it uses less digits than its factorization.

18273680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228434 (or 228428 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18273680 is about 4274.7725085670. The cubic root of 18273680 is about 263.3956946078.

The spelling of 18273680 in words is "eighteen million, two hundred seventy-three thousand, six hundred eighty".