90081660 has 96 divisors (see below), whose sum is σ = 274176000. Its totient is φ = 22014720.

The previous prime is 90081631. The next prime is 90081671. The reversal of 90081660 is 6618009.

It is a super-2 number, since 2×90081660² = 16229410936711200, which contains 22 as substring.

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

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, 34066 + ... + 36614.

It is an arithmetic number, because the mean of its divisors is an integer number (2856000).

Almost surely, 2^90081660 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 90081660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137088000).

90081660 is an abundant number, since it is smaller than the sum of its proper divisors (184094340).

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

90081660 is a wasteful number, since it uses less digits than its factorization.

90081660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611 (or 2609 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 90081660 is about 9491.1358645844. The cubic root of 90081660 is about 448.2759712807.

Adding to 90081660 its reverse (6618009), we get a palindrome (96699669).

The spelling of 90081660 in words is "ninety million, eighty-one thousand, six hundred sixty".