18455744728 has 8 divisors (see below), whose sum is σ = 34604521380. Its totient is φ = 9227872360.

The previous prime is 18455744689. The next prime is 18455744737. The reversal of 18455744728 is 82744755481.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18455744728² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1153484038 + ... + 1153484053.

Almost surely, 2^18455744728 is an apocalyptic number.

It is an amenable number.

18455744728 is a deficient number, since it is larger than the sum of its proper divisors (16148776652).

18455744728 is a wasteful number, since it uses less digits than its factorization.

18455744728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306968097 (or 2306968093 counting only the distinct ones).

The product of its digits is 10035200, while the sum is 55.

The spelling of 18455744728 in words is "eighteen billion, four hundred fifty-five million, seven hundred forty-four thousand, seven hundred twenty-eight".