99784582128 has 960 divisors, whose sum is σ = 391797145600. Its totient is φ = 23710579200.

The previous prime is 99784582127. The next prime is 99784582129. The reversal of 99784582128 is 82128548799.

99784582128 is a `hidden beast` number, since 99 + 78 + 458 + 2 + 1 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (99784582127) and next prime (99784582129).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99784582127) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 215517225 + ... + 215517687.

Almost surely, 2^99784582128 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 99784582128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195898572800).

99784582128 is an abundant number, since it is smaller than the sum of its proper divisors (292012563472).

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

99784582128 is a wasteful number, since it uses less digits than its factorization.

99784582128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 536 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The spelling of 99784582128 in words is "ninety-nine billion, seven hundred eighty-four million, five hundred eighty-two thousand, one hundred twenty-eight".