18272478442 has 8 divisors (see below), whose sum is σ = 27410328036. Its totient is φ = 9135702432.

The previous prime is 18272478377. The next prime is 18272478457. The reversal of 18272478442 is 24487427281.

It can be written as a sum of positive squares in 2 ways, for example, as 10681015801 + 7591462641 = 103349^2 + 87129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224403 + ... + 294790.

Almost surely, 2^18272478442 is an apocalyptic number.

18272478442 is a deficient number, since it is larger than the sum of its proper divisors (9137849594).

18272478442 is a wasteful number, since it uses less digits than its factorization.

18272478442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536792.

The product of its digits is 1605632, while the sum is 49.

The spelling of 18272478442 in words is "eighteen billion, two hundred seventy-two million, four hundred seventy-eight thousand, four hundred forty-two".