28565344640 has 64 divisors (see below), whose sum is σ = 78044614560. Its totient is φ = 9793830912.

The previous prime is 28565344603. The next prime is 28565344669. The reversal of 28565344640 is 4644356582.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3183617 + ... + 3192576.

Almost surely, 2^28565344640 is an apocalyptic number.

28565344640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28565344640 is an abundant number, since it is smaller than the sum of its proper divisors (49479269920).

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

28565344640 is an equidigital number, since it uses as much as digits as its factorization.

28565344640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6376219 (or 6376207 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 28565344640 in words is "twenty-eight billion, five hundred sixty-five million, three hundred forty-four thousand, six hundred forty".