28609394688 has 144 divisors (see below), whose sum is σ = 94433779440. Its totient is φ = 8174075904.

The previous prime is 28609394659. The next prime is 28609394713. The reversal of 28609394688 is 88649390682.

28609394688 is a `hidden beast` number, since 2 + 86 + 0 + 93 + 9 + 468 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (63).

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 11 ways as a sum of consecutive naturals, for example, 18156 + ... + 239892.

It is an arithmetic number, because the mean of its divisors is an integer number (655790135).

Almost surely, 2^28609394688 is an apocalyptic number.

28609394688 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 28609394688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47216889720).

28609394688 is an abundant number, since it is smaller than the sum of its proper divisors (65824384752).

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

28609394688 is a wasteful number, since it uses less digits than its factorization.

28609394688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221772 (or 221749 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 63.

The spelling of 28609394688 in words is "twenty-eight billion, six hundred nine million, three hundred ninety-four thousand, six hundred eighty-eight".