28318018665 has 96 divisors (see below), whose sum is σ = 49134003840. Its totient is φ = 13920242688.

The previous prime is 28318018661. The next prime is 28318018711. The reversal of 28318018665 is 56681081382.

It is not a de Polignac number, because 28318018665 - 2² = 28318018661 is a prime.

It is a super-2 number, since 2×28318018665² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28318018661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 32289207 + ... + 32290083.

It is an arithmetic number, because the mean of its divisors is an integer number (511812540).

Almost surely, 2^28318018665 is an apocalyptic number.

It is an amenable number.

28318018665 is a deficient number, since it is larger than the sum of its proper divisors (20815985175).

28318018665 is a wasteful number, since it uses less digits than its factorization.

28318018665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 28318018665 in words is "twenty-eight billion, three hundred eighteen million, eighteen thousand, six hundred sixty-five".