90390440 has 64 divisors (see below), whose sum is σ = 236856960. Its totient is φ = 30401280.

The previous prime is 90390409. The next prime is 90390463. The reversal of 90390440 is 4409309.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11795 + ... + 17885.

It is an arithmetic number, because the mean of its divisors is an integer number (3700890).

Almost surely, 2^90390440 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 90390440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118428480).

90390440 is an abundant number, since it is smaller than the sum of its proper divisors (146466520).

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

90390440 is a wasteful number, since it uses less digits than its factorization.

90390440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6162 (or 6158 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 90390440 is about 9507.3887056331. The cubic root of 90390440 is about 448.7875841096.

Adding to 90390440 its reverse (4409309), we get a palindrome (94799749).

The spelling of 90390440 in words is "ninety million, three hundred ninety thousand, four hundred forty".