99550 has 24 divisors (see below), whose sum is σ = 203112. Its totient is φ = 36000.

The previous prime is 99529. The next prime is 99551. The reversal of 99550 is 5599.

99550 = T₁₂₉ + T₁₃₀ + ... + T₁₃₉.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 460 + ... + 640.

It is an arithmetic number, because the mean of its divisors is an integer number (8463).

2⁹⁹⁵⁵⁰ is an apocalyptic number.

99550 is an abundant number, since it is smaller than the sum of its proper divisors (103562).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101556).

99550 is a wasteful number, since it uses less digits than its factorization.

99550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 28.

The square root of 99550 is about 315.5154512857. The cubic root of 99550 is about 46.3461598060.

It can be divided in two parts, 9 and 9550, that added together give a palindrome (9559).

The spelling of 99550 in words is "ninety-nine thousand, five hundred fifty".