990878 has 12 divisors (see below), whose sum is σ = 1729152. Its totient is φ = 424620.

The previous prime is 990851. The next prime is 990881. The reversal of 990878 is 878099.

It is a congruent number.

It is an unprimeable number.

990878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 4958 + ... + 5153.

It is an arithmetic number, because the mean of its divisors is an integer number (144096).

2⁹⁹⁰⁸⁷⁸ is an apocalyptic number.

990878 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

990878 is a deficient number, since it is larger than the sum of its proper divisors (738274).

990878 is a wasteful number, since it uses less digits than its factorization.

990878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10127 (or 10120 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 990878 is about 995.4285509267. The cubic root of 990878 is about 99.6950040538.

The spelling of 990878 in words is "nine hundred ninety thousand, eight hundred seventy-eight".