28708491217728 has 336 divisors, whose sum is σ = 92257276821120. Its totient is φ = 7840999305216.

The previous prime is 28708491217669. The next prime is 28708491217733. The reversal of 28708491217728 is 82771219480782.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 361105150 + ... + 361184642.

Almost surely, 2^{28708491217728} is an apocalyptic number.

28708491217728 is a gapful number since it is divisible by the number (28) 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 28708491217728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46128638410560).

28708491217728 is an abundant number, since it is smaller than the sum of its proper divisors (63548785603392).

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

28708491217728 is a wasteful number, since it uses less digits than its factorization.

28708491217728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81214 (or 81197 counting only the distinct ones).

The product of its (nonzero) digits is 50577408, while the sum is 66.

The spelling of 28708491217728 in words is "twenty-eight trillion, seven hundred eight billion, four hundred ninety-one million, two hundred seventeen thousand, seven hundred twenty-eight".