28620563328 has 448 divisors, whose sum is σ = 100069833600. Its totient is φ = 7979295744.

The previous prime is 28620563317. The next prime is 28620563339. The reversal of 28620563328 is 82336502682.

28620563328 is a `hidden beast` number, since 2 + 8 + 6 + 2 + 0 + 5 + 633 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (28620563317) and next prime (28620563339).

It is a tau number, because it is divible by the number of its divisors (448).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 28086403 + ... + 28087421.

Almost surely, 2^28620563328 is an apocalyptic number.

28620563328 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 28620563328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50034916800).

28620563328 is an abundant number, since it is smaller than the sum of its proper divisors (71449270272).

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

28620563328 is an equidigital number, since it uses as much as digits as its factorization.

28620563328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 28620563328 in words is "twenty-eight billion, six hundred twenty million, five hundred sixty-three thousand, three hundred twenty-eight".