28081814412 has 72 divisors (see below), whose sum is σ = 72005769360. Its totient is φ = 8506158080.

The previous prime is 28081814407. The next prime is 28081814417. The reversal of 28081814412 is 21441818082.

It is an interprime number because it is at equal distance from previous prime (28081814407) and next prime (28081814417).

It is not an unprimeable number, because it can be changed into a prime (28081814417) 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 23 ways as a sum of consecutive naturals, for example, 39039 + ... + 240182.

It is an arithmetic number, because the mean of its divisors is an integer number (1000080130).

Almost surely, 2^28081814412 is an apocalyptic number.

It is an amenable number.

28081814412 is an abundant number, since it is smaller than the sum of its proper divisors (43923954948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28081814412 is a wasteful number, since it uses less digits than its factorization.

28081814412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279291 (or 279272 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 39.

The spelling of 28081814412 in words is "twenty-eight billion, eighty-one million, eight hundred fourteen thousand, four hundred twelve".