99309280 has 144 divisors (see below), whose sum is σ = 279236160. Its totient is φ = 33266688.

The previous prime is 99309229. The next prime is 99309283. The reversal of 99309280 is 8290399.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99309283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 415401 + ... + 415639.

It is an arithmetic number, because the mean of its divisors is an integer number (1939140).

Almost surely, 2^99309280 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 99309280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139618080).

99309280 is an abundant number, since it is smaller than the sum of its proper divisors (179926880).

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

99309280 is a wasteful number, since it uses less digits than its factorization.

99309280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 99309280 is about 9965.4041563802. The cubic root of 99309280 is about 463.0877339352.

The spelling of 99309280 in words is "ninety-nine million, three hundred nine thousand, two hundred eighty".