99920000 has 80 divisors (see below), whose sum is σ = 248943750. Its totient is φ = 39936000.

The previous prime is 99919997. The next prime is 99920021. The reversal of 99920000 is 2999.

It can be written as a sum of positive squares in 5 ways, for example, as 399424 + 99520576 = 632^2 + 9976^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 79376 + ... + 80624.

Almost surely, 2^99920000 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 99920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124471875).

99920000 is an abundant number, since it is smaller than the sum of its proper divisors (149023750).

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

99920000 is an equidigital number, since it uses as much as digits as its factorization.

99920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 99920000 is about 9995.9991996798. Note that the first 3 decimals coincide. The cubic root of 99920000 is about 464.0350746375.

Adding to 99920000 its reverse (2999), we get a palindrome (99922999).

The spelling of 99920000 in words is "ninety-nine million, nine hundred twenty thousand".