28104867840 has 720 divisors, whose sum is σ = 112450052736. Its totient is φ = 5851054080.

The previous prime is 28104867827. The next prime is 28104867863. The reversal of 28104867840 is 4876840182.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 28104867840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 906608625 + ... + 906608655.

Almost surely, 2^28104867840 is an apocalyptic number.

28104867840 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 28104867840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56225026368).

28104867840 is an abundant number, since it is smaller than the sum of its proper divisors (84345184896).

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

28104867840 is an equidigital number, since it uses as much as digits as its factorization.

28104867840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 48.

The spelling of 28104867840 in words is "twenty-eight billion, one hundred four million, eight hundred sixty-seven thousand, eight hundred forty".