99387280 has 80 divisors (see below), whose sum is σ = 239453424. Its totient is φ = 38338560.

The previous prime is 99387269. The next prime is 99387283. The reversal of 99387280 is 8278399.

It can be written as a sum of positive squares in 8 ways, for example, as 31225744 + 68161536 = 5588^2 + 8256^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 99387280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99387283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514864 + ... + 515056.

Almost surely, 2^99387280 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 99387280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119726712).

99387280 is an abundant number, since it is smaller than the sum of its proper divisors (140066144).

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

99387280 is a wasteful number, since it uses less digits than its factorization.

99387280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 99387280 is about 9969.3169274530. The cubic root of 99387280 is about 463.2089424487.

The spelling of 99387280 in words is "ninety-nine million, three hundred eighty-seven thousand, two hundred eighty".