90009018 has 48 divisors (see below), whose sum is σ = 215351136. Its totient is φ = 26941920.

The previous prime is 90009001. The next prime is 90009037. The reversal of 90009018 is 81090009.

It is a junction number, because it is equal to n+sod(n) for n = 90008982 and 90009000.

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 23 ways as a sum of consecutive naturals, for example, 13696 + ... + 19172.

It is an arithmetic number, because the mean of its divisors is an integer number (4486482).

Almost surely, 2^90009018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90009018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107675568).

90009018 is an abundant number, since it is smaller than the sum of its proper divisors (125342118).

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

90009018 is a wasteful number, since it uses less digits than its factorization.

90009018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5579 (or 5576 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 90009018 is about 9487.3082589320. The cubic root of 90009018 is about 448.1554420477.

The spelling of 90009018 in words is "ninety million, nine thousand, eighteen".