18087728744 has 8 divisors (see below), whose sum is σ = 33914491410. Its totient is φ = 9043864368.

The previous prime is 18087728719. The next prime is 18087728749. The reversal of 18087728744 is 44782778081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11398124644 + 6689604100 = 106762^2 + 81790^2 .

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

It is a super-2 number, since 2×18087728744² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18087728744.

It is not an unprimeable number, because it can be changed into a prime (18087728749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130483039 + ... + 1130483054.

Almost surely, 2^18087728744 is an apocalyptic number.

It is an amenable number.

18087728744 is a deficient number, since it is larger than the sum of its proper divisors (15826762666).

18087728744 is a wasteful number, since it uses less digits than its factorization.

18087728744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260966099 (or 2260966095 counting only the distinct ones).

The product of its (nonzero) digits is 5619712, while the sum is 56.

The spelling of 18087728744 in words is "eighteen billion, eighty-seven million, seven hundred twenty-eight thousand, seven hundred forty-four".