998378556 has 24 divisors (see below), whose sum is σ = 2662343040. Its totient is φ = 285250992.

The previous prime is 998378539. The next prime is 998378569. The reversal of 998378556 is 655873899.

It is a self number, because there is not a number n which added to its sum of digits gives 998378556.

It is a congruent number.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 5942646 + ... + 5942813.

It is an arithmetic number, because the mean of its divisors is an integer number (110930960).

Almost surely, 2^998378556 is an apocalyptic number.

It is an amenable number.

998378556 is an abundant number, since it is smaller than the sum of its proper divisors (1663964484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998378556 is a wasteful number, since it uses less digits than its factorization.

998378556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11885473 (or 11885471 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 60.

The square root of 998378556 is about 31597.1289202041. The cubic root of 998378556 is about 999.4592262832.

The spelling of 998378556 in words is "nine hundred ninety-eight million, three hundred seventy-eight thousand, five hundred fifty-six".