99999796428 has 450 divisors, whose sum is σ = 320119018604. Its totient is φ = 27329136912.

The previous prime is 99999796409. The next prime is 99999796441. The reversal of 99999796428 is 82469799999.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 149 ways as a sum of consecutive naturals, for example, 4347817225 + ... + 4347817247.

Almost surely, 2^99999796428 is an apocalyptic number.

99999796428 is a gapful number since it is divisible by the number (98) 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 99999796428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160059509302).

99999796428 is an abundant number, since it is smaller than the sum of its proper divisors (220119222176).

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

99999796428 is an frugal number, since it uses more digits than its factorization.

99999796428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 35 counting only the distinct ones).

The product of its digits is 1428513408, while the sum is 81.

The spelling of 99999796428 in words is "ninety-nine billion, nine hundred ninety-nine million, seven hundred ninety-six thousand, four hundred twenty-eight".