99621128776 has 32 divisors (see below), whose sum is σ = 211745318400. Its totient is φ = 43559035200.

The previous prime is 99621128771. The next prime is 99621128779. The reversal of 99621128776 is 67782112699.

It is a self number, because there is not a number n which added to its sum of digits gives 99621128776.

It is not an unprimeable number, because it can be changed into a prime (99621128771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25205800 + ... + 25209751.

It is an arithmetic number, because the mean of its divisors is an integer number (6617041200).

Almost surely, 2^99621128776 is an apocalyptic number.

It is an amenable number.

99621128776 is an abundant number, since it is smaller than the sum of its proper divisors (112124189624).

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

99621128776 is a wasteful number, since it uses less digits than its factorization.

99621128776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50415589 (or 50415585 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 58.

The spelling of 99621128776 in words is "ninety-nine billion, six hundred twenty-one million, one hundred twenty-eight thousand, seven hundred seventy-six".