99878811 has 16 divisors (see below), whose sum is σ = 139324416. Its totient is φ = 63524736.

The previous prime is 99878773. The next prime is 99878827. The reversal of 99878811 is 11887899.

It is not a de Polignac number, because 99878811 - 2¹⁰ = 99877787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99878881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28206 + ... + 31548.

It is an arithmetic number, because the mean of its divisors is an integer number (8707776).

Almost surely, 2^99878811 is an apocalyptic number.

99878811 is a deficient number, since it is larger than the sum of its proper divisors (39445605).

99878811 is a wasteful number, since it uses less digits than its factorization.

99878811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3802.

The product of its digits is 290304, while the sum is 51.

The square root of 99878811 is about 9993.9387130400. The cubic root of 99878811 is about 463.9713043961.

The spelling of 99878811 in words is "ninety-nine million, eight hundred seventy-eight thousand, eight hundred eleven".