99988590 has 128 divisors (see below), whose sum is σ = 275208192. Its totient is φ = 23063040.

The previous prime is 99988579. The next prime is 99988591. The reversal of 99988590 is 9588999.

It is a self number, because there is not a number n which added to its sum of digits gives 99988590.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99988591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 636792 + ... + 636948.

It is an arithmetic number, because the mean of its divisors is an integer number (2150064).

Almost surely, 2^99988590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99988590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137604096).

99988590 is an abundant number, since it is smaller than the sum of its proper divisors (175219602).

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

99988590 is a wasteful number, since it uses less digits than its factorization.

99988590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274.

The product of its (nonzero) digits is 2099520, while the sum is 57.

The square root of 99988590 is about 9999.4294837256. The cubic root of 99988590 is about 464.1412291803.

The spelling of 99988590 in words is "ninety-nine million, nine hundred eighty-eight thousand, five hundred ninety".