28004349440 has 80 divisors (see below), whose sum is σ = 67191949440. Its totient is φ = 11193876480.

The previous prime is 28004349421. The next prime is 28004349473. The reversal of 28004349440 is 4494340082.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 28004349394 and 28004349403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4832945 + ... + 4838735.

It is an arithmetic number, because the mean of its divisors is an integer number (839899368).

Almost surely, 2^28004349440 is an apocalyptic number.

28004349440 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 28004349440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33595974720).

28004349440 is an abundant number, since it is smaller than the sum of its proper divisors (39187600000).

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

28004349440 is an equidigital number, since it uses as much as digits as its factorization.

28004349440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7703 (or 7687 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The spelling of 28004349440 in words is "twenty-eight billion, four million, three hundred forty-nine thousand, four hundred forty".