28894486140 has 144 divisors (see below), whose sum is σ = 94443148800. Its totient is φ = 7108383744.

The previous prime is 28894486111. The next prime is 28894486171. The reversal of 28894486140 is 4168449882.

It is a happy number.

28894486140 is a `hidden beast` number, since 28 + 89 + 448 + 61 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6945381 + ... + 6949539.

It is an arithmetic number, because the mean of its divisors is an integer number (655855200).

Almost surely, 2^28894486140 is an apocalyptic number.

28894486140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28894486140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47221574400).

28894486140 is an abundant number, since it is smaller than the sum of its proper divisors (65548662660).

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

28894486140 is a wasteful number, since it uses less digits than its factorization.

28894486140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7156 (or 7151 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 28894486140 in words is "twenty-eight billion, eight hundred ninety-four million, four hundred eighty-six thousand, one hundred forty".