18269749728 has 36 divisors (see below), whose sum is σ = 51954601608. Its totient is φ = 6089916480.

The previous prime is 18269749723. The next prime is 18269749741. The reversal of 18269749728 is 82794796281.

18269749728 is a `hidden beast` number, since 1 + 82 + 69 + 7 + 497 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18269749721) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 31718028 + ... + 31718603.

It is an arithmetic number, because the mean of its divisors is an integer number (1443183378).

Almost surely, 2^18269749728 is an apocalyptic number.

18269749728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18269749728 is an abundant number, since it is smaller than the sum of its proper divisors (33684851880).

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

18269749728 is a wasteful number, since it uses less digits than its factorization.

18269749728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63436647 (or 63436636 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 18269749728 in words is "eighteen billion, two hundred sixty-nine million, seven hundred forty-nine thousand, seven hundred twenty-eight".