99643428480 has 256 divisors, whose sum is σ = 321792831360. Its totient is φ = 26223575040.

The previous prime is 99643428473. The next prime is 99643428491. The reversal of 99643428480 is 8482434699.

It is a super-2 number, since 2×99643428480² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99643428480.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106342572 + ... + 106343508.

Almost surely, 2^99643428480 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 99643428480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160896415680).

99643428480 is an abundant number, since it is smaller than the sum of its proper divisors (222149402880).

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

99643428480 is a wasteful number, since it uses less digits than its factorization.

99643428480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627 (or 1615 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 57.

The spelling of 99643428480 in words is "ninety-nine billion, six hundred forty-three million, four hundred twenty-eight thousand, four hundred eighty".