99905328612 has 192 divisors, whose sum is σ = 282155892480. Its totient is φ = 30445977600.

The previous prime is 99905328587. The next prime is 99905328617. The reversal of 99905328612 is 21682350999.

It is a happy number.

99905328612 is a `hidden beast` number, since 9 + 9 + 90 + 532 + 8 + 6 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (99905328617) 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, 18138763 + ... + 18144269.

It is an arithmetic number, because the mean of its divisors is an integer number (1469561940).

Almost surely, 2^99905328612 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 99905328612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141077946240).

99905328612 is an abundant number, since it is smaller than the sum of its proper divisors (182250563868).

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

99905328612 is a wasteful number, since it uses less digits than its factorization.

99905328612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5819 (or 5811 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 99905328612 in words is "ninety-nine billion, nine hundred five million, three hundred twenty-eight thousand, six hundred twelve".