99943867420920 has 768 divisors, whose sum is σ = 364167757025280. Its totient is φ = 23640112742400.

The previous prime is 99943867420883. The next prime is 99943867420961. The reversal of 99943867420920 is 2902476834999.

99943867420920 is a `hidden beast` number, since 9 + 9 + 9 + 438 + 67 + 42 + 0 + 92 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 25554553765 + ... + 25554557675.

It is an arithmetic number, because the mean of its divisors is an integer number (474176766960).

Almost surely, 2^{99943867420920} is an apocalyptic number.

99943867420920 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 99943867420920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182083878512640).

99943867420920 is an abundant number, since it is smaller than the sum of its proper divisors (264223889604360).

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

99943867420920 is a wasteful number, since it uses less digits than its factorization.

99943867420920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596 (or 6589 counting only the distinct ones).

The product of its (nonzero) digits is 423263232, while the sum is 72.

The spelling of 99943867420920 in words is "ninety-nine trillion, nine hundred forty-three billion, eight hundred sixty-seven million, four hundred twenty thousand, nine hundred twenty".