99550990 has 32 divisors (see below), whose sum is σ = 223409664. Its totient is φ = 31028640.

The previous prime is 99550987. The next prime is 99551021. The reversal of 99550990 is 9905599.

It is a self number, because there is not a number n which added to its sum of digits gives 99550990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63874 + ... + 65413.

It is an arithmetic number, because the mean of its divisors is an integer number (6981552).

Almost surely, 2^99550990 is an apocalyptic number.

99550990 is an abundant number, since it is smaller than the sum of its proper divisors (123858674).

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

99550990 is a wasteful number, since it uses less digits than its factorization.

99550990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129312.

The product of its (nonzero) digits is 164025, while the sum is 46.

The square root of 99550990 is about 9977.5242420152. The cubic root of 99550990 is about 463.4631343917.

It can be divided in two parts, 995509 and 90, that added together give a palindrome (995599).

The spelling of 99550990 in words is "ninety-nine million, five hundred fifty thousand, nine hundred ninety".