99809210 has 32 divisors (see below), whose sum is σ = 192141072. Its totient is φ = 37196800.

The previous prime is 99809207. The next prime is 99809219. The reversal of 99809210 is 1290899.

It can be written as a sum of positive squares in 8 ways, for example, as 90193009 + 9616201 = 9497^2 + 3101^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99809219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14264 + ... + 20076.

Almost surely, 2^99809210 is an apocalyptic number.

99809210 is a deficient number, since it is larger than the sum of its proper divisors (92331862).

99809210 is a wasteful number, since it uses less digits than its factorization.

99809210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5938.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 99809210 is about 9990.4559455512. The cubic root of 99809210 is about 463.8635058535.

The spelling of 99809210 in words is "ninety-nine million, eight hundred nine thousand, two hundred ten".