90018780 has 192 divisors, whose sum is σ = 283143168. Its totient is φ = 21288960.

The previous prime is 90018767. The next prime is 90018781. The reversal of 90018780 is 8781009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90018781) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2093439 + ... + 2093481.

It is an arithmetic number, because the mean of its divisors is an integer number (1474704).

Almost surely, 2^90018780 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 90018780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141571584).

90018780 is an abundant number, since it is smaller than the sum of its proper divisors (193124388).

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

90018780 is a wasteful number, since it uses less digits than its factorization.

90018780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 90018780 is about 9487.8227217840. The cubic root of 90018780 is about 448.1716431476.

Adding to 90018780 its reverse (8781009), we get a palindrome (98799789).

The spelling of 90018780 in words is "ninety million, eighteen thousand, seven hundred eighty".