998962910640 has 480 divisors, whose sum is σ = 3572977314816. Its totient is φ = 259235665920.

The previous prime is 998962910639. The next prime is 998962910641. The reversal of 998962910640 is 46019269899.

It is an interprime number because it is at equal distance from previous prime (998962910639) and next prime (998962910641).

It is not an unprimeable number, because it can be changed into a prime (998962910641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 369028167 + ... + 369030873.

Almost surely, 2^998962910640 is an apocalyptic number.

998962910640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998962910640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1786488657408).

998962910640 is an abundant number, since it is smaller than the sum of its proper divisors (2574014404176).

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

998962910640 is a wasteful number, since it uses less digits than its factorization.

998962910640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239 (or 3221 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 998962910640 in words is "nine hundred ninety-eight billion, nine hundred sixty-two million, nine hundred ten thousand, six hundred forty".