998180556 has 12 divisors (see below), whose sum is σ = 2329087992. Its totient is φ = 332726848.

The previous prime is 998180531. The next prime is 998180581. The reversal of 998180556 is 655081899.

It is an interprime number because it is at equal distance from previous prime (998180531) and next prime (998180581).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 998180499 and 998180508.

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, 41590845 + ... + 41590868.

It is an arithmetic number, because the mean of its divisors is an integer number (194090666).

Almost surely, 2^998180556 is an apocalyptic number.

It is an amenable number.

998180556 is an abundant number, since it is smaller than the sum of its proper divisors (1330907436).

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

998180556 is a wasteful number, since it uses less digits than its factorization.

998180556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83181720 (or 83181718 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 51.

The square root of 998180556 is about 31593.9955687786. The cubic root of 998180556 is about 999.3931504748.

The spelling of 998180556 in words is "nine hundred ninety-eight million, one hundred eighty thousand, five hundred fifty-six".