998883090 has 112 divisors (see below), whose sum is σ = 2734135128. Its totient is φ = 262579968.

The previous prime is 998883089. The next prime is 998883097. The reversal of 998883090 is 90388899.

It can be written as a sum of positive squares in 4 ways, for example, as 870899121 + 127983969 = 29511^2 + 11313^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (998883097) by changing a digit.

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 55 ways as a sum of consecutive naturals, for example, 531232 + ... + 533108.

Almost surely, 2^998883090 is an apocalyptic number.

998883090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 998883090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1367067564).

998883090 is an abundant number, since it is smaller than the sum of its proper divisors (1735252038).

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

998883090 is a wasteful number, since it uses less digits than its factorization.

998883090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975 (or 1960 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 998883090 is about 31605.1117700919. Note that the first 3 decimals coincide. The cubic root of 998883090 is about 999.6275579708.

The spelling of 998883090 in words is "nine hundred ninety-eight million, eight hundred eighty-three thousand, ninety".