99999810 has 48 divisors (see below), whose sum is σ = 260694720. Its totient is φ = 26595360.

The previous prime is 99999787. The next prime is 99999821. The reversal of 99999810 is 1899999.

It is a super-2 number, since 2×99999810² = 19999924000072200, which contains 22 as substring.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38245 + ... + 40775.

It is an arithmetic number, because the mean of its divisors is an integer number (5431140).

Almost surely, 2^99999810 is an apocalyptic number.

99999810 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99999810 is an abundant number, since it is smaller than the sum of its proper divisors (160694910).

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

99999810 is a wasteful number, since it uses less digits than its factorization.

99999810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983 (or 2980 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The square root of 99999810 is about 9999.9904999955. The cubic root of 99999810 is about 464.1585893938.

The spelling of 99999810 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred ten".