98109990 has 96 divisors (see below), whose sum is σ = 281058336. Its totient is φ = 23546880.

The previous prime is 98109989. The next prime is 98109997. The reversal of 98109990 is 9990189.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98109997) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111432 + ... + 112308.

It is an arithmetic number, because the mean of its divisors is an integer number (2927691).

Almost surely, 2^98109990 is an apocalyptic number.

98109990 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 98109990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140529168).

98109990 is an abundant number, since it is smaller than the sum of its proper divisors (182948346).

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

98109990 is a wasteful number, since it uses less digits than its factorization.

98109990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014 (or 1011 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 98109990 is about 9905.0487126515. The cubic root of 98109990 is about 461.2160483525.

It can be divided in two parts, 981099 and 90, that added together give a palindrome (981189).

The spelling of 98109990 in words is "ninety-eight million, one hundred nine thousand, nine hundred ninety".