99989784 has 96 divisors (see below), whose sum is σ = 289167840. Its totient is φ = 31104000.

The previous prime is 99989783. The next prime is 99989803. The reversal of 99989784 is 48798999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99989783) 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, 184554 + ... + 185094.

It is an arithmetic number, because the mean of its divisors is an integer number (3012165).

Almost surely, 2^99989784 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 99989784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144583920).

99989784 is an abundant number, since it is smaller than the sum of its proper divisors (189178056).

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

99989784 is a wasteful number, since it uses less digits than its factorization.

99989784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721 (or 714 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 99989784 is about 9999.4891869535. The cubic root of 99989784 is about 464.1430766658.

The spelling of 99989784 in words is "ninety-nine million, nine hundred eighty-nine thousand, seven hundred eighty-four".