99291920 has 160 divisors (see below), whose sum is σ = 296980992. Its totient is φ = 30007296.

The previous prime is 99291893. The next prime is 99291931. The reversal of 99291920 is 2919299.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167144 + ... + 167736.

Almost surely, 2^99291920 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 99291920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148490496).

99291920 is an abundant number, since it is smaller than the sum of its proper divisors (197689072).

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

99291920 is a wasteful number, since it uses less digits than its factorization.

99291920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 99291920 is about 9964.5331049678. The cubic root of 99291920 is about 463.0607486372.

It can be divided in two parts, 9 and 9291920, that added together give a palindrome (9291929).

The spelling of 99291920 in words is "ninety-nine million, two hundred ninety-one thousand, nine hundred twenty".