99878663 has 4 divisors (see below), whose sum is σ = 99898800. Its totient is φ = 99858528.

The previous prime is 99878657. The next prime is 99878677. The reversal of 99878663 is 36687899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36687899 = 2713 ⋅13523.

It is a cyclic number.

It is not a de Polignac number, because 99878663 - 2¹⁶ = 99813127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99878599 and 99878608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99878633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3206 + ... + 14492.

It is an arithmetic number, because the mean of its divisors is an integer number (24974700).

Almost surely, 2^99878663 is an apocalyptic number.

99878663 is a deficient number, since it is larger than the sum of its proper divisors (20137).

99878663 is a wasteful number, since it uses less digits than its factorization.

99878663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20136.

The product of its digits is 3919104, while the sum is 56.

The square root of 99878663 is about 9993.9313085492. The cubic root of 99878663 is about 463.9710752258.

The spelling of 99878663 in words is "ninety-nine million, eight hundred seventy-eight thousand, six hundred sixty-three".