28105988252 has 6 divisors (see below), whose sum is σ = 49185479448. Its totient is φ = 14052994124.

The previous prime is 28105988233. The next prime is 28105988257. The reversal of 28105988252 is 25288950182.

It is a self number, because there is not a number n which added to its sum of digits gives 28105988252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28105988257) 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 as a sum of consecutive naturals, namely, 3513248528 + ... + 3513248535.

It is an arithmetic number, because the mean of its divisors is an integer number (8197579908).

Almost surely, 2^28105988252 is an apocalyptic number.

It is an amenable number.

28105988252 is a deficient number, since it is larger than the sum of its proper divisors (21079491196).

28105988252 is a wasteful number, since it uses less digits than its factorization.

28105988252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7026497067 (or 7026497065 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 50.

The spelling of 28105988252 in words is "twenty-eight billion, one hundred five million, nine hundred eighty-eight thousand, two hundred fifty-two".