999998878 has 8 divisors (see below), whose sum is σ = 1500133968. Its totient is φ = 499954224.

The previous prime is 999998869. The next prime is 999998903. The reversal of 999998878 is 878899999.

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, 25575 + ... + 51517.

It is an arithmetic number, because the mean of its divisors is an integer number (187516746).

Almost surely, 2^999998878 is an apocalyptic number.

999998878 is a deficient number, since it is larger than the sum of its proper divisors (500135090).

999998878 is a wasteful number, since it uses less digits than its factorization.

999998878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45218.

The product of its digits is 211631616, while the sum is 76.

The square root of 999998878 is about 31622.7588613011. The cubic root of 999998878 is about 999.9996259999. Note that the first 3 decimals are identical.

The spelling of 999998878 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, eight hundred seventy-eight".