99985550 has 24 divisors (see below), whose sum is σ = 212541456. Its totient is φ = 34280640.

The previous prime is 99985549. The next prime is 99985559. The reversal of 99985550 is 5558999.

It is a super-2 number, since 2×99985550² = 19994220417605000, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

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 (99985559) 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, 142487 + ... + 143186.

It is an arithmetic number, because the mean of its divisors is an integer number (8855894).

Almost surely, 2^99985550 is an apocalyptic number.

99985550 is an abundant number, since it is smaller than the sum of its proper divisors (112555906).

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

99985550 is a wasteful number, since it uses less digits than its factorization.

99985550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285692 (or 285687 counting only the distinct ones).

The product of its (nonzero) digits is 729000, while the sum is 50.

The square root of 99985550 is about 9999.2774738978. The cubic root of 99985550 is about 464.1365252981.

The spelling of 99985550 in words is "ninety-nine million, nine hundred eighty-five thousand, five hundred fifty".