18288990788 has 24 divisors (see below), whose sum is σ = 32467507800. Its totient is φ = 9013455360.

The previous prime is 18288990787. The next prime is 18288990791. The reversal of 18288990788 is 88709988281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5761113604 + 12527877184 = 75902^2 + 111928^2 .

It is not an unprimeable number, because it can be changed into a prime (18288990787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29963 + ... + 193586.

It is an arithmetic number, because the mean of its divisors is an integer number (1352812825).

Almost surely, 2^18288990788 is an apocalyptic number.

It is an amenable number.

18288990788 is a deficient number, since it is larger than the sum of its proper divisors (14178517012).

18288990788 is a wasteful number, since it uses less digits than its factorization.

18288990788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223847 (or 223845 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 68.

The spelling of 18288990788 in words is "eighteen billion, two hundred eighty-eight million, nine hundred ninety thousand, seven hundred eighty-eight".