998878899 has 16 divisors (see below), whose sum is σ = 1372547232. Its totient is φ = 645689088.

The previous prime is 998878889. The next prime is 998878901.

998878899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 998878899 - 2⁴ = 998878883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998878899.

It is not an unprimeable number, because it can be changed into a prime (998878879) 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, 17167 + ... + 47879.

It is an arithmetic number, because the mean of its divisors is an integer number (85784202).

Almost surely, 2^998878899 is an apocalyptic number.

998878899 is a deficient number, since it is larger than the sum of its proper divisors (373668333).

998878899 is a wasteful number, since it uses less digits than its factorization.

998878899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31046.

The product of its digits is 188116992, while the sum is 75.

The square root of 998878899 is about 31605.0454674566. The cubic root of 998878899 is about 999.6261599277.

The spelling of 998878899 in words is "nine hundred ninety-eight million, eight hundred seventy-eight thousand, eight hundred ninety-nine".