99581209789320 has 1024 divisors, whose sum is σ = 396502135603200. Its totient is φ = 22029339571200.

The previous prime is 99581209789267. The next prime is 99581209789331. The reversal of 99581209789320 is 2398790218599.

99581209789320 is a `hidden beast` number, since 9 + 9 + 581 + 2 + 0 + 9 + 7 + 8 + 9 + 32 + 0 = 666.

It is a super-2 number, since 2×99581209789320² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 4327536615 + ... + 4327559625.

It is an arithmetic number, because the mean of its divisors is an integer number (387209116800).

Almost surely, 2^{99581209789320} is an apocalyptic number.

99581209789320 is a gapful number since it is divisible by the number (90) 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 99581209789320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198251067801600).

99581209789320 is an abundant number, since it is smaller than the sum of its proper divisors (296920925813880).

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

99581209789320 is a wasteful number, since it uses less digits than its factorization.

99581209789320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23278 (or 23256 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 72.

The spelling of 99581209789320 in words is "ninety-nine trillion, five hundred eighty-one billion, two hundred nine million, seven hundred eighty-nine thousand, three hundred twenty".