998117648 has 40 divisors (see below), whose sum is σ = 2115668160. Its totient is φ = 452397440.

The previous prime is 998117641. The next prime is 998117663. The reversal of 998117648 is 846711899.

It is a Cunningham number, because it is equal to 31593²-1.

It is a self number, because there is not a number n which added to its sum of digits gives 998117648.

It is not an unprimeable number, because it can be changed into a prime (998117641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55286 + ... + 71082.

It is an arithmetic number, because the mean of its divisors is an integer number (52891704).

Almost surely, 2^998117648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998117648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057834080).

998117648 is an abundant number, since it is smaller than the sum of its proper divisors (1117550512).

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

998117648 is a wasteful number, since it uses less digits than its factorization.

998117648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16175 (or 16169 counting only the distinct ones).

The product of its digits is 870912, while the sum is 53.

The square root of 998117648 is about 31592.9999841737. Note that the first 4 decimals coincide. The cubic root of 998117648 is about 999.3721552268.

The spelling of 998117648 in words is "nine hundred ninety-eight million, one hundred seventeen thousand, six hundred forty-eight".