28211888840 has 16 divisors (see below), whose sum is σ = 63476749980. Its totient is φ = 11284755520.

The previous prime is 28211888827. The next prime is 28211888867. The reversal of 28211888840 is 4888811282.

It can be written as a sum of positive squares in 2 ways, for example, as 27813567076 + 398321764 = 166774^2 + 19958^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352648571 + ... + 352648650.

Almost surely, 2^28211888840 is an apocalyptic number.

28211888840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28211888840 is an abundant number, since it is smaller than the sum of its proper divisors (35264861140).

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

28211888840 is a wasteful number, since it uses less digits than its factorization.

28211888840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705297232 (or 705297228 counting only the distinct ones).

The product of its (nonzero) digits is 524288, while the sum is 50.

The spelling of 28211888840 in words is "twenty-eight billion, two hundred eleven million, eight hundred eighty-eight thousand, eight hundred forty".