90243660 has 96 divisors (see below), whose sum is σ = 274563072. Its totient is φ = 22014720.

The previous prime is 90243649. The next prime is 90243689. The reversal of 90243660 is 6634209.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 98605 + ... + 99515.

It is an arithmetic number, because the mean of its divisors is an integer number (2860032).

Almost surely, 2^90243660 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 90243660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137281536).

90243660 is an abundant number, since it is smaller than the sum of its proper divisors (184319412).

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

90243660 is a wasteful number, since it uses less digits than its factorization.

90243660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063 (or 1061 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 90243660 is about 9499.6663099290. Note that the first 3 decimals coincide. The cubic root of 90243660 is about 448.5445321171.

Adding to 90243660 its reverse (6634209), we get a palindrome (96877869).

It can be divided in two parts, 902436 and 60, that added together give a triangular number (902496 = T₁₃₄₃).

The spelling of 90243660 in words is "ninety million, two hundred forty-three thousand, six hundred sixty".