28909289472 has 240 divisors, whose sum is σ = 89386278912. Its totient is φ = 8139571200.

The previous prime is 28909289471. The next prime is 28909289483. The reversal of 28909289472 is 27498290982.

It is not an unprimeable number, because it can be changed into a prime (28909289471) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 25116097 + ... + 25117247.

Almost surely, 2^28909289472 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 28909289472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44693139456).

28909289472 is an abundant number, since it is smaller than the sum of its proper divisors (60476989440).

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

28909289472 is an equidigital number, since it uses as much as digits as its factorization.

28909289472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262 (or 1236 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 60.

The spelling of 28909289472 in words is "twenty-eight billion, nine hundred nine million, two hundred eighty-nine thousand, four hundred seventy-two".