28644550656 has 192 divisors, whose sum is σ = 81481982400. Its totient is φ = 8917352448.

The previous prime is 28644550643. The next prime is 28644550691. The reversal of 28644550656 is 65605544682.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 28644550599 and 28644550608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14517286 + ... + 14519258.

It is an arithmetic number, because the mean of its divisors is an integer number (424385325).

Almost surely, 2^28644550656 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 28644550656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40740991200).

28644550656 is an abundant number, since it is smaller than the sum of its proper divisors (52837431744).

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

28644550656 is a wasteful number, since it uses less digits than its factorization.

28644550656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154 (or 2134 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 51.

The spelling of 28644550656 in words is "twenty-eight billion, six hundred forty-four million, five hundred fifty thousand, six hundred fifty-six".