99897571620 has 768 divisors, whose sum is σ = 403638681600. Its totient is φ = 19910499840.

The previous prime is 99897571607. The next prime is 99897571637. The reversal of 99897571620 is 2617579899.

99897571620 is a nontrivial binomial coefficient, being equal to C(446985, 2).

It is a Harshad number since it is a multiple of its sum of digits (63).

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 255 ways as a sum of consecutive naturals, for example, 105487987 + ... + 105488933.

It is an arithmetic number, because the mean of its divisors is an integer number (525571200).

Almost surely, 2^99897571620 is an apocalyptic number.

99897571620 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99897571620 is the 446984-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99897571620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201819340800).

99897571620 is an abundant number, since it is smaller than the sum of its proper divisors (303741109980).

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

99897571620 is a wasteful number, since it uses less digits than its factorization.

99897571620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 63.

The spelling of 99897571620 in words is "ninety-nine billion, eight hundred ninety-seven million, five hundred seventy-one thousand, six hundred twenty".