28318018281 has 24 divisors (see below), whose sum is σ = 44690577984. Its totient is φ = 15623724480.

The previous prime is 28318018279. The next prime is 28318018303. The reversal of 28318018281 is 18281081382.

It is not a de Polignac number, because 28318018281 - 2¹ = 28318018279 is a prime.

It is a super-2 number, since 2×28318018281² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28318018181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 784050 + ... + 819371.

It is an arithmetic number, because the mean of its divisors is an integer number (1862107416).

Almost surely, 2^28318018281 is an apocalyptic number.

28318018281 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28318018281 is a deficient number, since it is larger than the sum of its proper divisors (16372559703).

28318018281 is a wasteful number, since it uses less digits than its factorization.

28318018281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603489 (or 1603460 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 42.

The spelling of 28318018281 in words is "twenty-eight billion, three hundred eighteen million, eighteen thousand, two hundred eighty-one".