28909467648 has 240 divisors, whose sum is σ = 90116666640. Its totient is φ = 9216294912.

The previous prime is 28909467619. The next prime is 28909467649. The reversal of 28909467648 is 84676490982.

28909467648 is a `hidden beast` number, since 28 + 90 + 9 + 467 + 64 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28909467649) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3811636 + ... + 3819212.

It is an arithmetic number, because the mean of its divisors is an integer number (375486111).

Almost surely, 2^28909467648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28909467648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45058333320).

28909467648 is an abundant number, since it is smaller than the sum of its proper divisors (61207198992).

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

28909467648 is an equidigital number, since it uses as much as digits as its factorization.

28909467648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7634 (or 7605 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 63.

The spelling of 28909467648 in words is "twenty-eight billion, nine hundred nine million, four hundred sixty-seven thousand, six hundred forty-eight".