18293728444 has 24 divisors (see below), whose sum is σ = 32135024768. Its totient is φ = 9112325040.

The previous prime is 18293728429. The next prime is 18293728471. The reversal of 18293728444 is 44482739281.

It is a super-2 number, since 2×18293728444² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18293728391 and 18293728400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4309387 + ... + 4313629.

Almost surely, 2^18293728444 is an apocalyptic number.

It is an amenable number.

18293728444 is a deficient number, since it is larger than the sum of its proper divisors (13841296324).

18293728444 is a wasteful number, since it uses less digits than its factorization.

18293728444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8065 (or 8063 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 52.

The spelling of 18293728444 in words is "eighteen billion, two hundred ninety-three million, seven hundred twenty-eight thousand, four hundred forty-four".