28312121268 has 24 divisors (see below), whose sum is σ = 73401796160. Its totient is φ = 9437373720.

The previous prime is 28312121219. The next prime is 28312121287. The reversal of 28312121268 is 86212121382.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 131074528 + ... + 131074743.

Almost surely, 2^28312121268 is an apocalyptic number.

It is an amenable number.

28312121268 is an abundant number, since it is smaller than the sum of its proper divisors (45089674892).

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

28312121268 is a wasteful number, since it uses less digits than its factorization.

28312121268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262149284 (or 262149276 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The spelling of 28312121268 in words is "twenty-eight billion, three hundred twelve million, one hundred twenty-one thousand, two hundred sixty-eight".