28318668988 has 24 divisors (see below), whose sum is σ = 50188950000. Its totient is φ = 13979442048.

The previous prime is 28318668979. The next prime is 28318668991. The reversal of 28318668988 is 88986681382.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182263 + ... + 299761.

It is an arithmetic number, because the mean of its divisors is an integer number (2091206250).

Almost surely, 2^28318668988 is an apocalyptic number.

It is an amenable number.

28318668988 is a deficient number, since it is larger than the sum of its proper divisors (21870281012).

28318668988 is a wasteful number, since it uses less digits than its factorization.

28318668988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118269 (or 118267 counting only the distinct ones).

The product of its digits is 63700992, while the sum is 67.

The spelling of 28318668988 in words is "twenty-eight billion, three hundred eighteen million, six hundred sixty-eight thousand, nine hundred eighty-eight".