28113689420 has 12 divisors (see below), whose sum is σ = 59038747824. Its totient is φ = 11245475760.

The previous prime is 28113689413. The next prime is 28113689437. The reversal of 28113689420 is 2498631182.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 702842216 + ... + 702842255.

It is an arithmetic number, because the mean of its divisors is an integer number (4919895652).

Almost surely, 2^28113689420 is an apocalyptic number.

28113689420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28113689420 is an abundant number, since it is smaller than the sum of its proper divisors (30925058404).

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

28113689420 is a wasteful number, since it uses less digits than its factorization.

28113689420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405684480 (or 1405684478 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 28113689420 in words is "twenty-eight billion, one hundred thirteen million, six hundred eighty-nine thousand, four hundred twenty".