90041820 has 96 divisors (see below), whose sum is σ = 276708096. Its totient is φ = 21696000.

The previous prime is 90041813. The next prime is 90041873. The reversal of 90041820 is 2814009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149520 + ... + 150120.

It is an arithmetic number, because the mean of its divisors is an integer number (2882376).

Almost surely, 2^90041820 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 90041820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138354048).

90041820 is an abundant number, since it is smaller than the sum of its proper divisors (186666276).

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

90041820 is a wasteful number, since it uses less digits than its factorization.

90041820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 90041820 is about 9489.0368320499. The cubic root of 90041820 is about 448.2098758875.

Adding to 90041820 its reverse (2814009), we get a palindrome (92855829).

The spelling of 90041820 in words is "ninety million, forty-one thousand, eight hundred twenty".