998749608 has 64 divisors (see below), whose sum is σ = 2617142400. Its totient is φ = 317011200.

The previous prime is 998749579. The next prime is 998749639. The reversal of 998749608 is 806947899.

It is a Cunningham number, because it is equal to 31603²-1.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122458 + ... + 130358.

It is an arithmetic number, because the mean of its divisors is an integer number (40892850).

Almost surely, 2^998749608 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 998749608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1308571200).

998749608 is an abundant number, since it is smaller than the sum of its proper divisors (1618392792).

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

998749608 is a wasteful number, since it uses less digits than its factorization.

998749608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8162 (or 8158 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 60.

The square root of 998749608 is about 31602.9999841787. Note that the first 4 decimals coincide. The cubic root of 998749608 is about 999.5830288259.

It can be divided in two parts, 9987 and 49608, that added together give a palindrome (59595).

The spelling of 998749608 in words is "nine hundred ninety-eight million, seven hundred forty-nine thousand, six hundred eight".