28563204648 has 256 divisors, whose sum is σ = 83164112640. Its totient is φ = 8095334400.

The previous prime is 28563204643. The next prime is 28563204661. The reversal of 28563204648 is 84640236582.

It is a junction number, because it is equal to n+sod(n) for n = 28563204597 and 28563204606.

It is not an unprimeable number, because it can be changed into a prime (28563204643) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29235136 + ... + 29236112.

It is an arithmetic number, because the mean of its divisors is an integer number (324859815).

Almost surely, 2^28563204648 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 28563204648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41582056320).

28563204648 is an abundant number, since it is smaller than the sum of its proper divisors (54600907992).

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

28563204648 is a wasteful number, since it uses less digits than its factorization.

28563204648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 48.

The spelling of 28563204648 in words is "twenty-eight billion, five hundred sixty-three million, two hundred four thousand, six hundred forty-eight".