99999878 has 8 divisors (see below), whose sum is σ = 163636200. Its totient is φ = 45454480.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999878 is 87899999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2272703 + ... + 2272746.

It is an arithmetic number, because the mean of its divisors is an integer number (20454525).

Almost surely, 2^99999878 is an apocalyptic number.

99999878 is a deficient number, since it is larger than the sum of its proper divisors (63636322).

99999878 is a wasteful number, since it uses less digits than its factorization.

99999878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545462.

The product of its digits is 26453952, while the sum is 68.

The square root of 99999878 is about 9999.9938999981. The cubic root of 99999878 is about 464.1586946033.

The spelling of 99999878 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred seventy-eight".